# Journal of Superconductivity Impact Factor & Information

Publisher: Springer Verlag

## Journal description

Journal of Superconductivity serves as the international forum for the most current information on the field. This highly acclaimed journal publishes peer-reviewed original papers and review articles that examine all aspects of the science and technology of superconductivity including new materials new mechanisms basic and technological properties new phenomena and small- and large-scale applications. Covering a wide scope of research the journal also features an annually updated bibliography on high T c superconductivity with entries cross-referenced by keywords developed by Dr. John Talvacchio of the Westinghouse R&D Center.

## Impact Factor Rankings

2015 Impact Factor Available summer 2015 0.461 0.553 0.793 0.794 0.764 0.718 0.823 1.032 0.798 0.851

## Impact factor over time

Impact factor
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Year

5-year impact 0.00 0.00 0.00 0.00 0.00 Journal of Superconductivity website Journal of superconductivity and novel magnetism, Superconductivity and novel magnetism 0896-1107 61187376 Periodical, Internet resource Journal / Magazine / Newspaper, Internet Resource

## Publisher details

• Pre-print
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• Author's pre-print on pre-print servers such as arXiv.org
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• Author's post-print on any open access repository after 12 months after publication
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• Articles in some journals can be made Open Access on payment of additional charge
• Classification
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## Publications in this journal

• Source
##### Article: The Kondo effect of surface excitons
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ABSTRACT: A recombination radiation line of real excitons in dense two-dimensional electron gas at the [100] silicon surface is observed in luminescence spectra of metal-oxide-semiconductor (MOS) structures. A new effect of anisotropic paramagnetic reduction of the luminescence line indicates a strong influence of the Kondo correlations on electron paramagnetism of the excitons.
Journal of Superconductivity 02/2008; DOI:10.1023/A:1023688614168
• ##### Article: Antiferromagnetic, Neutral, and Superconducting Band in La 2 CuO 4
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ABSTRACT: The symmetry of the Bloch functions in the conduction band of tetragonal and orthorhombic La2CuO4 is examined for the existence of symmetry-adapted and optimally localizable (usual or spin-dependent) Wannier functions. It turns out that such Wannier functions do not exist in the tetragonal phase. In the orthorhombic phase, on the other hand, the Bloch functions can be unitarily transformed in three different ways into optimally localizable Wannier functions: they can be chosen to be adapted to each of the three phases observed in the pure or doped material, that is, to the antiferromagnetic phase, to the superconducting phase or to the phase evincing neither magnetism nor superconductivity. This group-theoretical result is proposed to be interpreted within a nonadiabatic extension of the Heisenberg model. Within this model, atomic-like states represented by these Wannier functions are responsible for the stability of each of the three phases. However, all the three atomic-like states cannot exist in the tetragonal phase, but are stabilized by the orthorhombic distortion of the crystal. A simple model is proposed which may explain the physical properties of La2-x Sr x CuO4 as a function of the Sr concentration x.
Journal of Superconductivity 08/2006; 18(4):1-22. DOI:10.1007/s10948-005-0028-8
• ##### Article: Two Domains of the Parameter Space of the 2D Hubbard Model for HighT c Superconductors
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ABSTRACT: High-T c superconducting cuprates have two types of Fermi surfaces: simple-2D-tight-binding-band type (LSCO type) and the much deformed one (Bi2212 type). The difference is attributed to that of band parameter values, i.e., t′ ∼ −0.1 and t″ ∼ 0 versus t′ ∼ −0.3 and t″ ∼ 0.2 in terms of the second- and third-neighbor transfer energies t′ and t″, respectively (energy unit is the nearest-neighbor transfer energy t). Assuming a moderate value of on-site Coulomb energy U ∼ 6 and performing the variational Monte Carlo computation, we found that the two superconducting parameter domains exist in fact around these parameter sets, respectively, in which superconductivity predominates over spin density wave (SDW) due to the latter being at the brink of vanishing. Stripes were obtained in the first domain but tend to disappear in the second. In the latter domain there seems to exist parameter sets for which superconductivity appears without doping.
Journal of Superconductivity 01/2006; 18:203-207. DOI:10.1007/s10948-005-0085-z
• ##### Article: Unusual e g 3d x 2−y 2 Orbital Ordering and Low-Energy Excitations in the CE Structure of NaMn7O12
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ABSTRACT: Similarly to the half-doped manganese oxides with perovskite structure like La0.5Ca0.5MnO3, the double perovskite compound NaMn7O12 contains an equal number of Mn3+ and Mn4+ ions in the corner-sharing network of MnO6 octahedra and exhibits a CE order of the charge and spins of these ions at low temperature. Though, in NaMn7O12 the order is complete, the charge and spin ordering transitions are sharp and the system is free of disorder, phase coexistence or structural inhomogeneities thanks to the absence of chemical substitutions. Here we discuss two unusual features of the CE structure of NaMn7O12: (1) the e g 3d x 2−y 2 orbital ordering expected from the direct crystallographic observation of compressed Mn3+O6 octahedra below the charge ordering transition; (2) the existence of a large amount of low-energy excitations evidenced by the low temperature behavior of the specific heat. We propose a picture of nearly degenerate spin and orbital configurations of the CE structure arising from the peculiar orbital ordering. KEY WORDS:half-doped manganese oxides–CE-structure–orbital ordering–low-energy excitations.
Journal of Superconductivity 01/2006; 18:75-80. DOI:10.1007/s10948-005-0057-3
• ##### Article: The Phonon Modes with Strong Electron–Phonon Interactions in p- and n-Type High Tc Superconductors
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ABSTRACT: The phonon modes with strong electron–phonon interactions were investigated by two-phonon Raman scattering in p- and n-type high T c superconductors. In p-type superconductors, the strong electron–phonon interaction mode changes from the breathing mode at (π, π) to the half breathing mode at (π, 0) as carrier density increases across the optimum doping in LSCO or the 60K phase in YBCO. It is in good accordance with the change of the superconducting coherent peak position in k-space. In n-type superconductors, the strong electron–phonon interaction modes change from (0.4π, 0.4π) to (0.4π, 0) at the insulator–superconductor transition. Electron–phonon interactions play an important role in superconductivity. KEY WORDS:electron–phonon interaction–quasi-particle band
Journal of Superconductivity 11/2005; 18(5):779-783. DOI:10.1007/s10948-005-0080-4
• ##### Article: Cuprate Interband Superconducting Density for Doping Driven Spectral Overlaps
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ABSTRACT: We calculate the superconducting density for a model cuprate with gapped itinerant and defect subsystems brought into spectral overlap by progressive doping. The interband nature of the pairing prevents the manifestation of the normal state gaps in the superconducting density. These “extrinsic” gaps drive the pseudogap behavior until the overlap concentrations are reached. Further doping changes the nature of the quasiparticle minimal excitation energy and a pseudogap is transformed into the corresponding superconducting gap. The Uemura-type plot contains a sublinear segment at underdoping. KEY WORDS:Cuprate–Interband model–Superconducting density–Pseudogap
Journal of Superconductivity 11/2005; 18(5):705-708. DOI:10.1007/s10948-005-0063-5
• ##### Article: Direct Observation of Orbital Ordering in Layered Manganites
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ABSTRACT: Soft X-ray resonant diffraction is a new technique and there exist several examples of large resonant enhancements of charge and magnetic scattering that can be obtained at the L-edges of 3d transition metal oxides. Here we have employed resonant soft X-ray scattering at the manganese L edges which provide a direct measurement of the orbital ordering. We have studied the layered manganite La0.5Sr1.5MnO4 that displays charge, spin, and orbital ordering. Energy scans at constant wavevector show that there are two separate contributions to the observed scattering, direct Goodenough orbital ordering and strong cooperative Jahn–Teller distortions of the Mn3+ ions. Finally we will show how that the charge, spin and orbital degrees of freedom are strongly correlated in these materials. KEY WORDS:orbital ordering–manganites–X-ray scattering–synchrotron radiation
Journal of Superconductivity 11/2005; 18(5):687-691. DOI:10.1007/s10948-005-0059-1
• ##### Article: Possible Nature of Field-Induced Antiferromagnetic Ordering in SC Cuprates
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ABSTRACT: In the present work, the results of recent neutron scattering, STM, and NMR experiments concerning the structure of the vortex core in resistive state of the cuprates are discussed. It is demonstrated that “field-induced” antiferromagnetic (SDW) ordering observed in the SC state is the same as “temperature-induced” one arising above T c in the pseudogap (SDW) state. It is pointed out that in resistivity measurements, due to short mobile charge carrier relaxation time, a magnetic structure is sampled on much shorter time scale as compared with other techniques such as neutron scattering, Mossbauer effect, etc. It is noted that existing theoretical models mainly consider the SDW order only as competing to the SC one rather than stimulating the SC to appear at higher temperature. KEY WORDS:spin fluctuations–spin density wave–psseudogap–stripe structure
Journal of Superconductivity 11/2005; 18(5):713-717. DOI:10.1007/s10948-005-0068-0
• ##### Article: The Underdoped Region of the Phase Diagram of YBa2Cu3O6+x
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ABSTRACT: Here we present a reviewed phase diagram of the high-T c superconducting YBa2Cu3O6+ x compound, finely mapped in the strongly underdoped region (0 < x < 0.5), from the pure antiferromagnetic state to the superconducting regime. The Neèl and spin freezing temperatures have been measured by μSR experiments while the hole density per Cu atom in the CuO2 planes has been determined from the resistive T c and from Seebeck coefficients at 290K. The phase diagram is discussed in comparison to those of La2− x Sr x CuO4 and Y1− x Ca x Ba2Cu3O6 cuprate systems. KEY WORDS:YBa2Cu3O6+ x –high T c superconductors–antiferromagnetism–muon spin spectroscopy
Journal of Superconductivity 11/2005; 18(5):769-772. DOI:10.1007/s10948-005-0078-y
• ##### Article: T c as a Function of Electron Doping in Mg 10 B 2 Using Sc for Mg Substitution
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ABSTRACT: We have studied the variation of superconducting critical temperature T c as a function of electron doping in the Mg10B2 system using Sc for Mg substitution. The critical temperature in the10B isotope substituted system Mg1− x Sc x 10B2 increases by increasing the scandium content x in the range 0xT c of the natural boron system Mg1− x Sc x B2 is nearly constant. The overall difference of T c in Mg1− x Sc x B2 as function of x between the natural B and 10B isotope system seems to indicate that the isotope effect shows large variations with electron doping as expected for the T c enhancement driven by a shape resonance.
Journal of Superconductivity 11/2005; 18(5):67-70. DOI:10.1007/s10948-005-0053-7
• ##### Article: Polaron Formation in a Model Hamiltonian with Covalent Electron–Phonon Interactions
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ABSTRACT: We have performed an exact diagonalization of a many body Hamiltonian that includes electron correlations and electron–phonon interactions. Electronic and phononic parameters entering in the Hamiltonian were chosen for the cluster O(4)—Cu–O(4) cluster in YBa2Cu3O7. Electronic and phononic degrees of freedom are coupled through the bare electron hopping, as in the Su–Schieffer–Heeger (SSH) Hamiltonian [W. P. Su et al., Phys. Rev. Lett. 42, 1698 (1979); A. J. Heeger, Rev. Mod. Phys. 60, 781 (1988)]. Fixing all parameters entering in the model Hamiltonian, the electron–phonon coupling was varied in order to reproduce structural short-range distortions found in the z-axis direction for YBa2Cu3O7. Although the inferred structural distortions are reproduced, we find that this type of coupling, unlike the electron–phonon coupling introduced in Peierls–Hubbard models, does not lead to excitations with polaronic energies and negative isotopic shifts typical of polaronic excitations. KEY WORDS:electron–phonon coupling–structural distortions–SSH Hamiltonian
Journal of Superconductivity 11/2005; 18(5):723-726. DOI:10.1007/s10948-005-0071-5
• ##### Article: Bi2212 c-Axis Twist Bicrystal and Artificial and Natural Cross-Whisker Josephson Junctions: Strong Evidence for s-Wave Superconductivity and Incoherent c-Axis Tunneling
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ABSTRACT: We discuss the latest data from c-axis twist Josephson junction experiments on Bi2Sr2CaCu2O8+d_{8+\delta} (Bi2212) bicrystals and on artificially and naturally formed cross whiskers. All three experiments provide strong evidence for a dominant s-wave order parameter for T £ TcT\le T_{\rm c}. The bicrystal and natural cross-whisker data also provide strong evidence for incoherent c-axis tunneling across the intrinsic Bi2212 junctions, consistent with a strongly inhomogeneous material. KEY WORDS:Josephson junction–cuprates–superconducting order parameter
Journal of Superconductivity 11/2005; 18(5):697-700. DOI:10.1007/s10948-005-0061-7
• ##### Article: Superconducting Fluctuating Diamagnetism Versus Precursor Diamagnetism in Heterogeneous Superconductors
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ABSTRACT: The fluctuation-induced diamagnetism (FD) above the transition temperature T c is studied through the isothermal field-dependence of the diamagnetic magnetization M dia. While for T ≈ T c and H→0 one has –M dia ∝ (H)1/2,on increasing field an upturn occurs and |Mdia ||M_{{\rm dia}} | begins to decrease, in correspondence to field-induced quenching of the fluctuating pairs. For BCS superconductors (SC) as MgB2 the upturn field H up is in the range 100–800Oe, while in optimally doped high-temperature SC(HT c SC) H up is expected in the range of several Tesla, because of the small coherence length. At variance, in non-homogeneous HT c SC (under- or overdoped) or in the presence of impurities causing diffuse transition, strong increase of M dia and H up reduced by order of magnitudes are observed. The reasons of these behaviors are discussed in the report. In particular the difference between the FD in heterogeneous HT c SC (related to SF) and the precursor diamagnetism for diffuse transitions such as in Al-doped MgB2 (unrelated to SF) is emphasized and it is shown how the temperature dependence of H up discriminates between the two effects. KEY WORDS:diborides–cuprates–fluctuating diamagnetism
Journal of Superconductivity 11/2005; 18(5):763-767. DOI:10.1007/s10948-005-0077-z
• ##### Article: Linear Response Theory Around a Localized Impurity in the Pseudogap Regime of an Anisotropic Superconductor
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ABSTRACT: We compare and contrast the polarizability of a d-wave superconductor in the pseudogap regime, within the precursor pairing scenario (dPG), and of a d-density-wave (dDW) state, characterized by a d-wave hidden order parameter, but no pairing. Our study is motivated by STM imaging experiments around an isolated impurity, which may in principle distinguish between precursor pairing and dDW order in the pseudogap regime of the high- $T_{c}$ superconductors. In both cases, the ${\bf q}$ -dependence of the polarizability is characterized by an azimuthal modulation, consistent with the d-wave symmetry of the underlying state. However, only the dDW result shows the fingerprints of nesting, with nesting wave vector ${{\bf Q}}=(\pi,\pi)$ , albeit imperfect, due to a nonzero value of the hopping ratio $t^\prime /t$ in the band dispersion relation. As a consequence of nesting, the presence of hole pockets is also reflected by the $({\bf q},\omega)$ dependence of the retarded polarizability.
Journal of Superconductivity 11/2005; 18(5-6). DOI:10.1007/s10948-005-0048-4
• ##### Article: Evidence for Nanostructures and Filaments in HTSC From the Electrical Transport Measurements
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ABSTRACT: Recent experimental evidence for the presence of nanostructures (stripe-like features or nanodomains) in HTSC, implies that the flow of the transport current through these materials could occur through quasi-1D filaments, and consequently HTSC materials could behave like a glass with their properties governed by a 2D network of superconducting and normal filaments. We investigated the resistive transport properties of HTSC (YBCO and TBCCO) and their dependence on time, in the normal and the superconducting states. KEY WORDS:nanostructures–filaments–electrical transport–high temperature superconductors
Journal of Superconductivity 11/2005; 18(5):693-696. DOI:10.1007/s10948-005-0060-8
• ##### Article: ARPES Spectra from Bond-Centered Stripe Phase of Moderately Doped Cuprates
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ABSTRACT: Using a combination of the bond formalism and the spin polaron approach we calculate the single particle spectral function for the system of stripes which take the form of two-leg ladder-like domain walls (DWs) between antiferromagnetic (AF) domains with the changing across each DW by π phase of the sublattice magnetization. We assume that the ordered bonds which are in the singlet state, form in the DW a pattern which resembles two layers of a brick wall. We concentrate on the doping level 1/8 and on levels slightly above this value when, as suggested by experiments, the distance between axes of nearest stripes is four lattice spacings and the linear filling of stripes is about 1/2. By comparing the calculated and measured spectra we demonstrate that among three simplest choices of bond order in the DW, singlets formed on rungs, singlets formed on nearest legs on both sides of the stripe axis and the brick wall structure, a most obvious resemblance to the ARPES spectra at the Fermi energy from the doped La2CuO4 in the stripe phase shows the single particle spectral weight of the stripe system formed in the underlying spin background with bond order on the nearest leg on both sides of the stripe axis. This conclusion is consistent with the result of the stability analysis reported in a separate paper. KEY WORDSdoped 2D antiferromagnet–stripes–photoelectron spectra
Journal of Superconductivity 11/2005; 18(5):809-812. DOI:10.1007/s10948-005-0084-0