T Kato

Los Alamos National Laboratory, Los Alamos, California, United States

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Publications (588)1430.14 Total impact

  • [Show abstract] [Hide abstract]
    ABSTRACT: IntroductionSince the discovery of REBa2Cu3O7-y (RE: Rare Earth element, REBCO) superconductors, they have been expected as the best candidates for the power cable application due to its high critical temperature (Tc) and critical current density (Jc). Among those REBCO superconductors, GdBa2Cu3O7-y (GdBCO) have been receiving great interest because they have higher Tc and Jc than YBa2Cu3O7-y [1].GdBCO with various types of precipitates as artificial pinning centers (APCs) have been proposed to minimize the anisotropy of Jc characteristics under the magnetic field. Among those precipitates, BaHfO3 (BHO) was found most effective precipitates as APCs in GdBCO film prepared by pulsed laser deposition (PLD) method [2]. It is therefore necessary to investigate not only the morphologies but also the dispersion of BHO precipitates within the GdBCO, to understand the role of BHO for the superconducting characteristics. In this study, morphologies and dispersions of BHO precipitates were characterized three-dimensional by scanning transmission electron tomography ExperimentalBHO dispersed GdBCO films were fabricated on Hastelloy C-276TM substrates with buffer layers of CeO2/LaMnO3/MgO/ Gd2ZrO7 by PLD method.To observe microstructure of GdBCO film with BHO precipitates, cross-section TEM specimens were prepared by FIB method using Quanta 3D-200 (FEI, USA) with acceleration voltage from 2 to 30 kV. Three-dimensional information such as morphology and dispersion, of BHO precipitates were characterized by electron tomography using STEM-HAADF. Result and discussionFigure 1 shows three-dimensional reconstructed volume of BHO precipitates in GdBCO, which revealed that fine BHO precipitates have rod- and plate-like morphologies with homogeneous dispersion in GdBCO. In addition, growth directions of these precipitates were found with wide angular distributions from growth direction of GdBCO. Anisotropy of Jc in the magnetic fields was probably enhanced by various growth directions and homogeneous dispersion of nanosized BHO within GdBCO.jmicro;63/suppl_1/i26/DFU080F1F1DFU080F1Fig. 1.Three-dimensional reconstructed volume of BHO.
    Microscopy (Oxford, England). 11/2014; 63 Suppl 1:i26-i27.
  • Edi Suharyadi, Takeshi Kato, Satoshi Iwata
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    ABSTRACT: We have investigated the modification of the microstructure and magnetic properties of Co/Pt multilayer films with various layer structures using ion beam irradiation. Cr/[Co/Pt] multilayer films prepared by a magnetron sputtering deposition on a surface oxidized Si substrate were irradiated by ${30 ~hbox{keV} {hbox{Kr}}^+}$ ion beam with various ion doses from $1times 10^{14}$ to $5times 10^{15} ~hbox{ions/cm}^{2}$. The modifications of magnetic properties and microstructures due to ${hbox{Kr}}^+$ ion irradiation depended on Co/Pt layer structures. The as-prepared $[{hbox{Co}}(0.4 ~hbox{nm})/{hbox{Pt}}(0.45 ~hbox{nm})]_{15}$ multilayer films were confirmed to exhibit the square shaped $Mhbox{-}H$ loop and the perpendicular easy axis with a saturation magnetization of 620 emu/cc and coercivity of 1.1 kOe. After the irradiation with ion dose of $5times 10^{15} ~hbox{ions/cm}^{2}$, the easy axis changes from perpendicular to in-plane direction. The coercivity and saturation magnetization decrease down to 2% and 13% of its original values, respectively. The decrease of coercivity and saturation magnetization is due to the implantation of the Cr atom in the top most layers into Co/Pt multilayer films caused by ${hbox{Kr}}^+$ ion irradiation, as confirmed from Auger electron spectroscopy (AES) depth profiles.
    IEEE Transactions on Magnetics 01/2014; 50(1):1-4. · 1.21 Impact Factor
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    ABSTRACT: In order to investigate an influence of Gd/Ba substitution x in Gd1+xBa2-xCu3Oy (GdBCO) on superconducting properties and microstructures of BaHfO3 (BHO) in GdBCO films, we fabricated the films on IBAD-MgO substrate by pulsed laser deposition (PLD) method. As a result, the number density of BHO nanorods were decreased from 2000 to 1100/μm2 with increasing x up to x = 0.07. If x > 0.07, the density of BaHfO3 nanorods were almost the same with 2000/μm2. Tcs of the BaHfO3 doped films were improved from 88.0 to 90.6 K with increasing x. In addition, the films with x from 0.07 to 0.12 showed high pinning force density Fp, especially the x = 0.10 films shows high Fp = 23.0 GN/m3 at 77 K in B//c.
    Physics Procedia 01/2014; 58:158–161.
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    ABSTRACT: We have developed a reliable fabrication process based on a laser scribing method for multi-filamentary coated conductors with a low alternating current loss. This process consists of shallow laser irradiation and two-step chemical etching. The shallow laser irradiation, which penetrates into only a masking polymer tape and a silver stabilizing layer, suppresses generation of dross that is formed due to melting and hardening of a metal substrate. The two-step chemical etching individually for the stabilizing and the superconducting layers prevents over-etching of the superconducting layer and thus suppresses degradation of the critical current (Ic). By using the developed laser scribing process, we realized an improvement of processing speed and a reduction of Ic degradation at the same time. Subsequently, we developed reel-to-reel equipment to apply this process to coated conductors several hundred meters long. We succeeded in fabricating 280 m and 70 m long coated conductors with 5 mm width divided into three and five filaments, respectively. It was confirmed that they had one-third and one-fifth hysteresis loss, respectively, in comparison with that before processing, and high inter-filament resistance, over 0.1 MΩ cm. The typical degradation rates of Ic in the developed laser scribing process were less than 20%.
    Superconductor Science and Technology 08/2013; 26(10):105016. · 2.80 Impact Factor
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    ABSTRACT: Y1-xGdxBa2Cu3O7-y with BaZrO3 film was fabricated on CeO2 buffered LaMnO3/ion beam assisted deposition-MgO/Gd2Zr2O7/Hastelloy C276TM substrates by the metal organic deposition process using trifluoroacetates. Both microstructural and analytical characterizations were performed by transmission electron microscopy with selected area electron diffraction method and energy dispersive X-ray spectroscopy. The thickness of Y1-xGdxBa2Cu3O7-y with BaZrO3 film was found approximately 700nm and the film was composed of c-axis oriented Y1-xGdxBa2Cu3O7-y grains. Several types of particles, (Y,Gd)2Cu2O5, CuO and BaZrO3, were formed within the Y1-xGdxBa2Cu3O7-y film, whose sizes were about 100-200nm for (Y,Gd)2Cu2O5 and CuO particles, and about 10-20nm for BaZrO3 particles, respectively. In the Y1-xGdxBa2Cu3O7-y film, (Y,Gd)2Cu2O5 and CuO particles were dispersed heterogeneously, whereas BaZrO3 nanoparticles were found dispersed homogeneously with random orientation. In addition, electron tomographic observation was carried out to attain the three-dimensional information of polyhedral BaZrO3 nanoparticles.
    Micron 07/2013; · 2.06 Impact Factor
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    ABSTRACT: It has been recognized that BaHfO3 (BHO) pinning centers introduced into GdBa2Cu3O6 +y (GdBCO) coated conductors show high pinning performance at high magnetic fields. This pinning property was ascribed to the strong pinning force of the BHO nano-rods and also to the improved upper critical field, Bc2, probably due to the scattering of electrons by the interface between the nano-rods and the superconducting matrix. In this paper the critical current properties of GdBCO coated conductors with different amounts of BHO nano-rods are theoretically investigated. It is found that BHO nano-rods are promising to improve the high field performance of GdBCO coated conductors.
    IEEE Transactions on Applied Superconductivity 06/2013; 23(3):8000304-8000304. · 1.32 Impact Factor
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    ABSTRACT: To elucidate the self-epitaxy mechanism of pulsed-laser deposition-CeO2, a hypothetical relationship with the substrate was derived based on the ion-beam-assisted deposition layer-processing method: the smaller the misorientation angle, the larger the crystallite size. In-plane misorientation angle dependences of crystallite sizes of ion-beam-assisted deposition-MgO and LaMnO3 as substrates for CeO2 deposition, obtained using X-ray diffraction and transmission electron microscopy, indicated that the hypothesis is plausible. This relationship is regarded as a prerequisite for self-epitaxy because large crystallites with small strains would be energetically favorable when CeO2 particles crystallize on them. Eventually, they will grow to dominant grains, which is a possible self-epitaxy mechanism.
    IEEE Transactions on Applied Superconductivity 06/2013; 23(3):6601005-6601005. · 1.32 Impact Factor
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    ABSTRACT: We studied the effect of systematically-controlled size (22–83 nm) and density (0.1–13 × 1021 m−3) of strong pinning random BaMO3 (M=Zr, Nb, Sn) nanoparticles (NPs) by engineering of their inclusion in (Y0.77Gd0.23)Ba2Cu3Oy ((Y,Gd)BCO) coated conductors. The critical current density (Jc) gradually increases from that of pure (Y,Gd)BCO to that of 3 wt% BZO with increasing density of NPs for H || c and H || 45°. Moreover, at low/intermediate fields the films with higher densities of isotropic pinning centers show nearly isotropic angular dependence at both 77 and 65 K, indicating that a high density of spherical nanoparticles effectively pins vortices over a broad angular range. We find that the enhancement of Jc depends mainly on the density of the NPs and not on their size. The vortex melting transition (characterized by the critical exponent (s) of the resistive transition) changes, particularly at H || 45° in films with higher densities of NPs. This change is reflected in a decrease of s to a value very close to that observed for H || c, similar to that of a Bose-glass. Thus, the density and morphology of the pinning centers are important factors determining not only Jc but also the character of the solid–liquid transition.
    Superconductor Science and Technology 01/2013; 26(3):035008. · 2.80 Impact Factor
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    ABSTRACT: Background and study aims: The aim of the current study was to assess the detection rate of the right adrenal gland and the diagnostic ability of endoscopic ultrasound (EUS) and fine-needle aspiration (FNA) for the diagnosis of adrenal metastasis in potentially resectable lung cancer.Patients and methods: This retrospective cohort study included a consecutive series of 150 patients undergoing EUS/EUS - FNA for staging of lung cancer. The detection rate of the right adrenal gland by EUS and the diagnostic accuracies of computed tomography (CT), positron emission tomography-CT (PET-CT), and EUS/EUS - FNA for the diagnosis of adrenal metastasis were evaluated.Results: The right adrenal gland was visualized by EUS in 131 patients (87.3 %); the left adrenal gland was visualized in all patients. Findings suggestive of metastasis in either one of the adrenal glands or in both were observed in 6 patients (4.0 %) by CT, in 5 patients (3.3 %) by PET-CT, and in 11 patients (7.3 %) by EUS. EUS - FNA was performed simultaneously in the 11 patients, and in 4 patients the diagnosis of metastasis was established. The accuracy for the diagnosis of adrenal metastasis was 100 % for EUS/EUS - FNA, 96.0 % for CT, and 97.0 % for PET-CT (P = 0.1146). Conclusions: As well as the left adrenal gland, the right adrenal gland was also usually visible by EUS. EUS/EUS - FNA provided an accurate diagnosis of adrenal metastasis, although the prevalence of adrenal metastasis was relatively low in these patients with potentially resectable lung cancer.
    Endoscopy 01/2013; · 5.20 Impact Factor
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    ABSTRACT: TFA-MOD (Metal Organic Deposition using Trifluoro-acetates) process is of considerable practical concern for future applications since it can fabricate high performance coated conductors (CCs) with low cost. In this study, we developed the process for fabricating thick films in BZO nanoparticle doped Y0.77Gd0.23Ba1.5Cu3Oy (YGdBCO) CCs in order to realize high Ic values under magnetic field. The effect of RTR (Reel To Reel)-dip-coating conditions on microstructure, Jc(-B-θ) properties, etc. was investigated in order to fabricate crack-free thick and high performance films. A BZO doped YGdBCO film with uniform 3.0 μm thickness showed the high in-field Ic and Jc values of 55.6 A/cm-w and 0.18 MA/cm2@77.8K, 3T, respectively.
    Physics Procedia 01/2013; 45:153–156.
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    ABSTRACT: Three types of superconducting GdBa2Cu3O7−x (GdBCO) layers containing rods of either BaHfO3 (BHO), BaZrO3 (BZO), or BaSnO3 (BSO) were fabricated by pulsed laser deposition on Hastelloy substrates with a CeO2 based textured buffer layer. The critical currents (J c) values of the GdBCO layers containing those nano-rods are enhanced compared with those of pristine GdBCO layer in high magnetic fields. In order to investigate the relationships between their superconductive properties and their nanostructures, they were characterized in detail by transmission electron microscopy (TEM). TEM is the only method for direct observation of these nano-rods in the GdBCO grains. The GdBCO layers were mainly composed of c-axis oriented GdBCO grains containing numerous nano-sized rods. The crystal orientation relationships between the GdBCO and the nano-rods were as follows; (001)GdBCO//(001)nano-rods and (100)GdBCO//(100) nano-rods. The average diameters of the BHO and the BZO nano-rods were 4.5 and 5.6 nm, respectively. The BSO nano-rods were thicker than other rods. These nano-rods in the central region of the c-axis oriented GdBCO grains were aligned parallel to the c-axis of the GdBCO, while nano-rods in the outer region of the c-axis oriented grains were tilted away from the c-axis. With increase in the thickness of the GdBCO layers, the ratio of the BZO or the BSO nano-rods aligned parallel to the c-axis to those tilted away from the c-axis decreased, so that the J c-B- profiles of the thicker GdBCO layers containing the BZO or the BSO nano-rods became flatter. The BHO nano-rods were homogeneously distributed throughout the GdBCO, and their average length of was less than that of the other nano-rods. The homogeneous distribution and short length of the BHO nano-rods enhanced the J c values of the GdBCO layers containing them in high magnetic fields. The J c-B- profiles of the GdBCO layers containing the BHO were independent of the layer thickness. From these results, we will discuss about the morphologies and distributions of suitable vortex pinning for applications of GdBCO coated conductor in high magnetic fields.
    Journal of Materials Science 01/2013; 48(1):125-131. · 2.31 Impact Factor
  • T. Kato, K. Kawai, Y. Suzuoki
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    ABSTRACT: An electric power system containing high penetration photovoltaic power generation system (PVS) should employ a highly accurate day-ahead forecast method of aggregated power output of PVS in the generation scheduling so as to realize the economic load dispatching. Considering the load-following capability of utility generators, however, small forecast error is not so influential, while large forecast error should be avoided. By using a simplified unit commitment model, this study evaluates the forecast accuracy of aggregated PVS power output by means of the amount of shortage or surplus of power supply in the electric power system. As a result, the shortage occurs occasionally, requiring the increase in the operating reserve. The surplus occasionally occurs in spring even without the forecast error. Avoiding the large forecast error contributes to the decrease in the operating-reserve of utility generators as well as the suppressed PVS power output, even though the average forecast accuracy is not improved so much.
    Power and Energy Society General Meeting (PES), 2013 IEEE; 01/2013
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    ABSTRACT: Addition of BaHfO3 (BHO) nano-rods as pinning centers into a GdBa2Cu3Oy (GdBCO) coated conductor dramatically improves the critical current properties in high magnetic fields. This is partly ascribed to the strong flux pinning of these pinning centers. In this paper it is reported that this improvement is mainly caused by unexpected enhancement of the upper critical field, Bc2. The mechanism of the enhancement of Bc2 is not yet clear, although the strain around the interface between the pinning center and the superconducting matrix or the interface itself may scatter electrons. This result suggests that the critical current property of REBa2Cu3Oy (RE: rare earth elements, REBCO) coated conductors could be designed not only by tailoring the microstructure of pinning centers but also by controlling the intrinsic superconducting property. Especially, the selection of pinning material and its content that determines Bc2 is expected to be a key problem for further improvement of the pinning performance at high magnetic fields.
    Superconductor Science and Technology 10/2012; 25(12):125003. · 2.80 Impact Factor
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    ABSTRACT: The introduction of effective artificial pinning centers into pulsed laser deposition derived Gd1Ba2Cu3O7−δ coated conductors has been studied with a view to improving the Ic–B–θ properties. BaMOx (M = metal) was introduced into Gd1Ba2Cu3O7−δ film, with the expectation of forming fine nanorods such as BaZrO3 ones. BaHfO3 doped Gd1Ba2Cu3O7−δ coated conductors showed remarkably good Ic–B–θ characteristics, even at high temperature. A short sample with 1 µm film thickness prepared using a reel-to-reel system showed a minimum Ic value of 30 A/cm-w@77 K (A/cm-w@77 K to be read as ‘amps per centimeter width, at 77 K’) at 3 T. The minimum Jc value of ∼0.3 MA cm−2@77 K at 3 T was independent of the film thickness up to 2.9 µm. The 2.9 µm thick film showed a minimum Ic value of 84.8 A/cm-w@77 K at 3 T, corresponding to >200 A/cm-w@65 K at 5 T.
    Superconductor Science and Technology 06/2012; 25(6). · 2.80 Impact Factor
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    ABSTRACT: High penetration photovoltaic power generation system (PVS) would cause some negative impacts on the stable operation of electric power system. On the other hand, when PVSs are widely dispersed, the total power output fluctuation would be smoothed. In order to evaluate the spatial average insolation fluctuation by using the insolation data observed at the limited number of points, we have developed the method to take the smoothing-effect around the observation point into account. Then, by using the insolation data observed at 61 points in the Chubu region in Japan, this study statistically evaluated the long-cycle fluctuation of the spatial average insolation. As the results, the absolute value of the maximum fluctuation width (MFW) of ensemble average insolation calculated with 120 min width window ranges mainly between 200 and 300 W/m2, while it is larger than 400 W/m2 in 6 days (1.7%). The results suggest that the reliable forecast method of spatial average insolation is needed to mitigate the impact of total power output change due to the insolation change of 400 W/m2 in 120 min.
    Power and Energy Society General Meeting, 2012 IEEE; 01/2012
  • T. Kato, Y. Suzuoki
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    ABSTRACT: The high penetration photovoltaic power generation systems (PVS) may cause the voltage rise of a power distribution system. As one of the measures, we focus on the daytime operation of heat pump water heater (HPWH). This study introduces the brief idea for scheduling the daytime operation so that the total electricity demand change of a number of HP follows the insolation change in a day. Then, this study demonstrates the effect of daytime operation using the electricity and hot-water demand observed in 10 households for a year. As the result, when the daytime operation is applied to HPWH in a household with PVS, the voltage rise can be mitigated without causing the under voltage condition due to the unnecessary daytime operation.
    Engineering and Technology (S-CET), 2012 Spring Congress on; 01/2012
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    ABSTRACT: We discussed the development mechanism of the streamer channel leading to breakdown in a short air gap, by using an ultra-high speed measuring system. We clarified that the initiation of the secondary streamer leading to breakdown is attributed to an electron injection from the grounded plane electrode to the residual channel made by the primary streamer. In addition, by selective measurement of the discharge current waveform of single streamer channel leading to breakdown, the breakdown was verified to be dominated by the development of the secondary streamer and the subsequent Joule heating process focusing on the single streamer channel.
    High Voltage Engineering and Application (ICHVE), 2012 International Conference on; 01/2012
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    ABSTRACT: We investigated the influence of AC voltage prestressing on the electrical-tree inception voltage in LDPE. When AC voltage prestress was not imposed, the impulse-tree inception voltage increased with the size of water tree due to the electrical field relaxation. On the other hand, when AC voltage prestress was imposed, the impulse-tree inception voltage did not change with the water-tree size and was lower than that without AC voltage prestressing. The FTIR absorption measurements showed several absorptions between 650 and 1500 cm-1, which did not exist in the sample without AC voltage prestressing. Besides, the TEM observation revealed that the AC voltage prestressing increased the density and size of micro voids and some of them were aligned in the direction of applied electric field. These results suggest that AC voltage prestressing causes structural change in the water tree and enhances material degradation, leading to lower tree-inception voltage.
    Electrical Insulation and Dielectric Phenomena (CEIDP), 2012 Annual Report Conference on; 01/2012
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    ABSTRACT: Recently, transesophageal endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) has been evaluated for mediastinal nodal staging (N staging) of lung cancer, as this technique is less invasive than mediastinoscopy and possibly more accurate than 18F-fluorodeoxyglucose positron emission tomography with computed tomography (PET-CT). However, EUS-FNA does not provide access to pretracheal and hilar lymph nodes. More recently, endobronchial ultrasound-guided transbronchial needle aspiration (EBUS-TBNA) has been introduced as a novel technique for accessing pretracheal and hilar lymph nodes. Although the combined endoscopic approach of EUS-FNA and EBUS-TBNA is presumably more accurate than PET-CT, only a few reports have quantitatively evaluated its diagnostic ability. Therefore, we prospectively assessed the diagnostic yield of this combined endoscopic approach for mediastinal N staging of lung cancer. A consecutive series of 120 patients with suspected resectable lung cancer on CT findings underwent PET-CT and combined EUS-FNA/EBUS-TBNA. The accuracy and other diagnostic indices of the combined approach in mediastinal N staging were compared with those of PET-CT. Among the enrolled patients, a final pathological N stage was established in 110 patients. The accuracy of the combined approach using EUS-FNA and EBUS-TBNA was significantly higher than that of PET-CT (90.0 % vs. 73.6 %; P < 0.0001). The sensitivity, specificity, and positive and negative predictive values were respectively 71.8 %, 100 %, 100 %, and 86.6 % for the combined approach vs. 47.4 %, 87.5 %, 66.7 %, and 75.9 % for PET-CT. The combined endoscopic approach using EUS-FNA and EBUS-TBNA provided excellent diagnostic performance. Therefore, this approach is strongly recommended before surgery or mediastinoscopy to avoid futile thoracotomy and surgical intervention.
    Endoscopy 12/2011; 43(12):1082-9. · 5.20 Impact Factor
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    ABSTRACT: We have reported SmBa2Cu3Oy (SmBCO) films on single crystalline substrates prepared by low-temperature growth (LTG) technique. The LTG-SmBCO films showed high critical current densities in magnetic fields compared with conventional SmBCO films prepared by pulsed laser deposition (PLD) method. In this study, to enhance critical current (Ic) in magnetic field, we fabricated thick LTG-SmBCO films on metal substrates with ion-beam assisted deposition (IBAD)-MgO buffer and estimated the Ic and Jc in magnetic fields.All the SmBCO films showed c-axis orientation and cube-on-cube in-plane texture. Tc of the LTG-SmBCO films were 93.1–93.4K. Jc and Ic of a 0.5μm-thick SmBCO film were 3.0MA/cm2 and 150A/cm-width at 77K in self-field, respectively. Those of a 2.0μm-thick film were 1.6MA/cm2 and 284A/cm-width respectively. Although Ic increased with the film thickness increasing up to 2μm, the Ic tended to be saturated in 300A/cm-width. From a cross sectional TEM image of the SmBCO film, we recognized a-axis oriented grains and 45° grains and Cu–O precipitates. Because these undesired grains form dead layers, Ic saturated above a certain thickness. We achieved that Ic in magnetic fields of the LTG-SmBCO films with a thickness of 2.0μm were 88A/cm-width at 1T and 28A/cm-width at 3T.
    Physica C Superconductivity 11/2011; 471(21):937-939. · 1.11 Impact Factor

Publication Stats

6k Citations
1,430.14 Total Impact Points


  • 2013
    • Los Alamos National Laboratory
      • Materials Physics and Applications Division
      Los Alamos, California, United States
  • 2012–2013
    • Kyushu University
      • Department of Materials Science and Engineering
      Hukuoka, Fukuoka, Japan
  • 2003–2013
    • Japan Fine Ceramics Center
      Nagoya, Aichi, Japan
    • Hokkaido University
      • Graduate School of Engineering
      Sapporo-shi, Hokkaido, Japan
  • 1991–2013
    • Gifu University Hospital
      Gihu, Gifu, Japan
  • 1993–2012
    • Nagoya University
      • • Department of Electrical Engineering and Computer Science
      • • Graduate School of Engineering
      • • Center for Integrated Research in Science and Engineering (CIRSE)
      Nagoya, Aichi, Japan
  • 2006–2011
    • Japanese Red Cross
      Edo, Tōkyō, Japan
  • 2010
    • Osaka University
      • Graduate School of Dentistry
      Suika, Ōsaka, Japan
    • University of Tsukuba
      Tsukuba, Ibaraki, Japan
  • 2009–2010
    • Osaka City University
      Ōsaka, Ōsaka, Japan
  • 1992–2010
    • St. Marianna University School of Medicine
      • • Institute of Medical Science
      • • Clinical Proteomics and Molecular Medicine
      • • Department of Medicine
      Kawasaki, Kanagawa-ken, Japan
    • Tokyo Medical and Dental University
      • Department of Medicine
      Edo, Tōkyō, Japan
  • 2001–2009
    • Fujita Health University
      • • Department of Internal Medicine
      • • Department of Physiology
      • • Department of Endocrinology and Metabolism
      Nagoya, Aichi, Japan
    • Kanazawa University
      • Department of Biophysical Genetics
      Kanazawa, Ishikawa, Japan
    • Aichi Human Service Center
      Касугай, Aichi, Japan
  • 1990–2009
    • Tokyo University of Science
      • Department of Applied Biological Science
      Edo, Tōkyō, Japan
  • 2006–2008
    • NEC Corporation
      Edo, Tōkyō, Japan
  • 2001–2008
    • Kyoto Prefectural University of Medicine
      • Department of Radiology
      Kyoto, Kyoto-fu, Japan
  • 2007
    • Nippon Medical School
      • Department of Rheumatology
      Tokyo, Tokyo-to, Japan
    • Gifu University
      • Graduate School of Medicine
      Gihu, Gifu, Japan
  • 1982–2007
    • Aichi Cancer Center
      Ōsaka, Ōsaka, Japan
  • 1998–2006
    • University of Yamanashi
      • • Interdisciplinary Graduate School of Medicine and Engineering
      • • Department of Electrical and Electronic Engineering
      • • Department of Computer Science and Media Engineering
      Kōfu-shi, Yamanashi-ken, Japan
  • 2004
    • University of Leicester
      • Department of Engineering
      Leicester, ENG, United Kingdom
  • 1981–2003
    • Nagoya City University
      • • Department of Internal Medicine
      • • Department of Orthopedic Surgery
      • • Medical School
      • • Department of Biochemistry
      Nagoya, Aichi, Japan
  • 2000–2001
    • Saitama Medical University
      • Saitama Medical Center
      Saitama, Saitama-ken, Japan
    • The University of Calgary
      • Department of Biochemistry and Molecular Biology
      Calgary, Alberta, Canada
  • 1996–2000
    • Tokyo University of Pharmacy and Life Science
      • School of Pharmacy
      Tokyo, Tokyo-to, Japan
  • 1997
    • Aichi Medical University
      • Division of Internal Medicine
      Okazaki, Aichi, Japan
  • 1994–1997
    • University of Mississippi Medical Center
      • Department of Physiology and Biophysics
      Jackson, MS, United States
  • 1988–1997
    • The University of Tokyo
      • • Faculty & Graduate School of Medicine
      • • Institute of Medical Science
      Tokyo, Tokyo-to, Japan
  • 1987–1997
    • Gunma University
      • Department of Clinical Laboratory Medicine
      Maebashi, Gunma Prefecture, Japan
  • 1983–1985
    • Tokyo Institute of Technology
      • Chemistry Department
      Tokyo, Tokyo-to, Japan
  • 1979–1981
    • University of Chicago
      Chicago, Illinois, United States