Elena Bartolomé

Elena Bartolomé
Escola Universitària Salesiana de Sarrià | EUSS · Research Group EUSS

PhD on Applied Physics

About

101
Publications
9,126
Reads
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962
Citations
Additional affiliations
September 2006 - present
Escola Universitària Salesiana de Sarrià
Position
  • Engineering teacher
September 2006 - present
Escola Universitària Salesiana de Sarrià
Position
  • Tenured lecturer
January 2006 - August 2006
Autonomous University of Barcelona
Position
  • PostDoc Position
Education
September 1998 - March 2002
University of Twente
Field of study
  • Applied Physics
September 1992 - September 1998
University of Zaragoza
Field of study
  • Physics

Publications

Publications (101)
Article
Full-text available
Many active, inquiry-based learning activities nowadays rely upon the students' capacity to perform efficient information research on the Internet. Study and Research Paths (SRPs) have been proposed to model inquiry learning, and successfully used as teaching formats in different areas. In an SRP the search for an answer to a generating question (Q...
Article
Full-text available
We present the magnetic properties of the metal-organic framework {[CoCxAPy]·2.15 H2O}n (Cx = bis(carboxypropyl)tetramethyldisiloxane; APy = 4,4`-azopyridine) (1) that builds up from the stacking of 2D coordination polymers. The 2D-coordination polymer in the bc plane is formed by the adjacent bonding of [CoCxAPy] 1D two-leg ladders with Co dimer r...
Article
Full-text available
The synthesis of a terbium-based 2D metal–organic framework (MOF), of formula [Tb(MeCOO)(PhCOO)2] (1), a crystalline material formed by neutral nanosheets held together by Van der Waals interactions, is presented. The material can be easily exfoliated by sonication and deposited onto different substrates. Uniform distributions of Tb-2D MOF flakes o...
Article
Failure Mode and Effect Analysis (FMEA) is a powerful quality tool, widely used in industry, for the identification of failure modes, their effects and causes. In this work, we investigated the utility of FMEA in the education field to improve active learning processes. In our case study, the FMEA principles were adapted to assess the risk of failu...
Article
We report the microwave assisted synthesis of a bidimensional (2D) MOF of formula [Dy(MeCOO)(PhCOO)2]n (1) and its magnetically diluted analogue [La0.9Dy0.1(MeCOO)(PhCOO)2] (1 d). 1 is a 2D material with single‐ion‐magnet (SIM) behaviour and 1 d is a multifunctional, magnetic and luminescent 2D material. 1 can be exfoliated into stable nanosheets b...
Article
Microwave assisted synthesis is applied to prepare a dysprosium 2D-MOF with simple carboxylato ligands, [Dy(MeCOO)(PhCOO)2]n (1). The Dy(3+) ions are arranged into nanosheets in a hexagonal pattern, stacked by van der Waals forces similar to those of graphene. The magnetically diluted MOF 1 d is a bifunctional 2D luminescent material with SIM prope...
Article
A Study and Research Path (SRP) is a model, based on the Anthropological Theory of the Didactic (ATD), which describes the inquiry processes that take place when a new, generating question (Q0) is considered. The investigation of the question through different study and inquiry approaches leads to a rooted tree sequence of derived questions and ans...
Article
Iron-phtalocyanines (FePc) adsorbed onto a Ag(110) substrate self-assemble into different monolayer phases going from rectangular to different oblique phases, with increasing molecular density. We have investigated the oxygen uptake capability of the different phases and their associated magneto-structural changes. Our study combines scanning tunne...
Article
Stacking faults are ubiquitous structural defects in YBa2Cu3O7 high Tc superconductors. Far from being detrimental, the control of the defect landscape, i.e. the length, density and distribution of YBa2Cu4Oy (Y124) intergrowths, changing the nanostrain of the material can be used to enhance the vortex pinning properties of the superconductor, as re...
Preprint
Anisotropy is an intrinsic factor that dictates the magnetic properties of YBCO, thus with great impact for many applications. Artificial pinning centres are often introduced in an attempt to mitigate its effect, resulting in less anisotropic electrical and magnetic properties. However, the nanoengineering of the superconductor makes the quantifica...
Chapter
Defects are ubiquitous in materials. In high-temperature superconductors (HTS), certain defects play an important role; by pinning quantized vortices in the presence of magnetic field, they enable dissipationless transport of high current densities. Therefore, determining the atomic structure of defects as well as understanding how they behave and...
Article
The intrinsic and effective anisotropies, both in the liquid and solid vortex regimes, of YBa2Cu3O7 (YBCO) pristine and nanocomposite thin films have been investigated. Angular resistivity measurements under varying fields and temperatures were performed to characterize the intrinsic vs effective anisotropy of samples in the regime of long-range vo...
Article
Full-text available
Two new neodymium molecular magnets of formula {[Nd(α-fur)3(H2O)2]·DMF}n (1) and {[Nd0.065La0.935(α-fur)3(H2O)2]}n (2), α-fur=C4H3OCOO, have been synthesized. In (1) the furoate ligands, in bidentate bridging mode, consolidate zig-zag chains running along the a-direction. Compound (2) is a magnetically diluted complex of a polymeric chain along the...
Article
We report the synthesis, crystal structure and magnetic properties of a new heteronuclear polymeric complex based on non-Kramers Tb ion and carboxylic α-fur= C4H3OCOO ligands: {[Tb2Ba(α-fur)8(H2O)4]·2H2O}n. The α-furoate ligands consolidate 1D zig-zag chains running along the c-axis, formed by Tb2 dimers separated by Ba ions. Ab initio calculations...
Article
Full-text available
The rational design of the magnetic anisotropy of molecular materials constitutes a goal of primary importance in molecular magnetism. Indeed, the applications of molecular nanomagnets, such as single‐molecule magnets and molecular magnetic refrigerants, depend on the full control over this property. Axially anisotropic magnetic systems are frequen...
Article
Study and research path (SRP) is an inquiry-based teaching format grounded in the Anthropological Theory of the Didactic. One of the specific characteristics of SRP is its task-design basis, which includes explicitly questioning the knowledge at stake in study processes. In this work, we propose general guidelines for the design of SRPs for Enginee...
Article
Full-text available
In our follow-up work on the anisotropy evaluation of Co complexes, we have become aware of an error in a theoretical development included in the ESI, section B, of the aforementioned paper. Namely in the Section titled “Magnetization versus magnetic field and magnetic heat capacity in a random oriented powdered sample of an orthorhombic S = 1/2 sy...
Article
We report the synthesis, crystal structure and photo-magnetic properties of novel Tb/Eu polymeric complexes of general formula {TbxEu1-x(α-fur)3(H2O)3}n, supported by 2-furancarboxilic acid: the homonuclear Tb(III) complex {Tb} (1), four heterodinuclear complexes, {Tb0.8Eu0.2} (2), {Tb0.7Eu0.3} (3), {Tb0.3Eu0.7} (4), {Tb0.1Eu0.9} (5), and Eu(III)-o...
Article
Full-text available
Total control over the electronic spin relaxation in molecular nanomagnets is the ultimate goal in the design of new molecules with evermore realizable applications in spin-based devices. For single-ion lanthanide systems, with strong spin-orbit coupling, the potential applications are linked to the energetic structure of the crystal field levels a...
Article
Full-text available
We present the preparation of a new architecture of coated conductor by Inkjet printing of low fluorine YBa2Cu3O7-x on top of SuperOx tape: CGO/LMO/IBAD-MgO/Y2O3/Al2O3/Hastelloy. A 5-layered multi-deposited, 475 nm thick YBCO film was structurally and magnetically characterized. A good texture was achieved using this combination of buffer layers, r...
Article
Full-text available
High Tc superconductor–ferromagnetic heterostructures constitute an appealing playground to study the interplay between flux vortices and magnetic moments. Here, the capability of a solution-derived route to grow hybrid YBa2Cu3O7-ferromagnetic nanocomposite epitaxial thin films from preformed spinel ferrite (MFe2O4, M = Mn, Co) nanoparticles (NPs)...
Chapter
Molecular magnets containing lanthanide ions have been receiving an increasing level of attention during the last years. The applicability of molecular magnets on foreseeable devices and new technologies, such as spintronic components, spin valves, or quantum bits, relies on the achievement of magnetic bistability with long relaxation times, such t...
Chapter
Although defects may be seen as detrimental, they play essential roles in many materials. In some complex oxides for instance, they present an opportunity to enhance particular properties, or even engineer new ones. An archetypal example is the high-Tc superconductor YBa2Cu3O7−δ (YBCO), where defects are indispensable to immobilize quantized vortic...
Article
In this paper we present the characterization of a complex with the formula [Mn2Ca2(hmp)6(H2O)4(CH3CN)2](ClO4)4 (1), where hmp-H = 2-(hydroxymethyl)pyridine. Compound 1 crystallizes in the monoclinic space group C2/c with the cation lying on an inversion centre. Static magnetic susceptibility, magnetization and heat capacity measurements reflect a...
Article
In this contribution we report on the structural and magnetic changes along a catalytic cycle of a new dense, “quasi-squared” FePc submonolayer phase (R3) evaporated on Ag(110). X-ray magnetic circular dichroism (XMCD) experiments at the Fe L2,3 edge were performed on four samples: the as-evaporated phase (R3), two differently oxygenated samples (O...
Research
Full-text available
Emerging Diluted Ferromagnetism in High-Tc Superconductors Driven by Point Defect Clusters
Article
Full-text available
Defects in ceramic materials are generally seen as detrimental to their functionality and applicability. Yet, in some complex oxides, defects present an opportunity to enhance some of their properties or even lead to the discovery of exciting physics, particularly in the presence of strong correlations. A paradigmatic case is the high-temperature s...
Article
We report the synthesis, crystal structure and magnetic properties of a new molecular complex based on a Tb(iii) ion supported by 2-furancarboxylic molecules: {Tb(α-fur)3(H2O)3}n (α-fur = C4H3OCOO). Two slightly different Tb sites (A and B) exist depending on the position of one of the dangling ligands. Ab initio calculations predict that, for both...
Article
Full-text available
High quality CoFe2O4 nanoparticles were synthesized using a one-pot, microwave assisted method, that allows forming stable colloidal solutions in alcoholic solvents, as required for the preparation by Chemical Solution Deposition of hybrid nanocomposite ferromagnetic-high Tc YBa2Cu3O7 superconducting films or devices. We have investigated how the t...
Article
Full-text available
Correction for 'Magnetic relaxation versus 3D long-range ordering in {Dy2Ba(α-fur)8}n furoate polymers' by E. Bartolomé et al., Dalton Trans., 2014, 43, 10999-11013.
Article
Vortex creep in YBa2Cu3O7 − x (YBCO) films grown from the trifluoracetate (TFA) chemical route with BaZrO3 and Ba2YTaO6 second-phase nanoparticles (NPs) has been investigated by magnetic relaxation measurements. We observe that in YBCO nanocomposites the phenomenological crossover line from the elastic to the plastic creep regime is shifted to high...
Article
Full-text available
The room temperature reaction of [Mn2O2(bipy)4](ClO4)3 (bipy = 2,2’-bipyridine) with Ca(CHCl2COO)2 in methanol produced a yellow crystalline material. The X-ray determined structure comprises of a multiple calcium(II) carboxylate bridged rod-like structure which is decorated with [Mn(bipy)2(OH2)]2+ subunits. The redox behaviour for the complex in H...
Article
Full-text available
The lanthanide(iii) cyanoacetate complexes of the formula {[Ln2(CNCH2COO)6(H2O)4]·2H2O}n, where Ln = Eu (), Gd (), Nd (), have been prepared and characterized by X-ray diffraction analysis. Complexes and are isostructural and differ from the binding scheme of the neodymium compound , structurally described earlier. In all cases, the cyano group of...
Article
Full-text available
A novel Dy-complex formulated as {[Dy2Ba(α-C4H3OCOO)8.(H2O)4].2H2O}n, {Dy2Ba(α−fur)8}n, has been synthesized, structurally characterized, and magnetically and thermally investigated as a function of field and temperature, down to 85 mK. The α-furoate ligands consolidate 1D zig-zag chains formed by Dy2 dimers separated by Ba ions. Ab initio calculat...
Article
Full-text available
The superconductor industry is demanding new methodologies to manufacture km-long, high quality coated conductors at high growth rates, using cost-effective, scalable processes. We report on the fabrication by an all-chemical deposition method of highly textured, thick (0.9 μm) inkjet-printed YBCO films, using a Ce0.9Zr0.1O2 (CZO) capping layer dep...
Article
Full-text available
The synthesis and magnetostructural properties of a new low-dimensional magnetic system based on α-furoate ligands, {[Dy(α-C4H3OCOO)(μ-(α-C4H3OCOO))2(H2O)3]}n, abbreviated {Dy(α-fur)3}n, are reported. X-ray diffraction experiments results evidence the presence of two different Dy coordination environment types differing only in the position of one...
Article
It has been recently shown that solution-derived YBa2Cu3O7−x (YBCO) nanocomposites can reach extraordinary pinning forces at 77 K, thanks to the isotropic nanostrain introduced by nanoparticles. In this paper we demonstrate that nanostrain pinning is even effective very close to the irreversibility line (IL). Ac susceptibility and transport measure...
Article
Full-text available
The magnetic properties of the porous metal-organic complex Co(bpy)(1.5)(NO(3))(2) (bpy = 4,4'-bipyridine), investigated by SQUID magnetometry, EPR and heat capacity measurements, are reported. The tongue-and-groove structure of this complex is formed by the assembly of T-shaped building blocks, where each Co is bound to three bpy ligands. Co(II) i...
Article
YBCO films grown by the trifluoroacetate (TFA) method with increasing number of BaZrO3 (BZO) nanoparticles have been measured by in-field angular transport measurements to investigate changes in the pinning landscape. The isotropic and anisotropic contributions to the critical current density, Jc(H), with the magnetic field applied in and orientati...
Article
Full-text available
Different successful approaches have recently merged to create artificial pinning centers in YBCO, in the quest to reach coated conductors with higher current performances. We have investigated by ac susceptibility how the different defects affect vortex pinning at high magnetic fields and temperatures, close to the irreversibility line. We analyse...
Article
An ac susceptibility methodology has been applied to investigate the vortex dynamics of YBa2Cu3O7−x–BaZrO3 nanocomposites grown by the chemical solution deposition TFA route, close to the irreversibility line. By analysing the linear, non-dissipative Campbell regime at low ac fields, we determined the temperature and field dependence of the restori...
Article
Full-text available
The generation of defects in NbSe(2) single crystals by electron irradiation has been investigated by a combination of ac susceptibility and structural measurements. Remarkably, thanks to the layered structure of NbSe(2), we show that electronic irradiation cannot only create point defects but also in-plane extended defects, which modify anisotropi...
Article
The mech. properties of melt-textured YBCO bulk boundaries are a topic of special interest esp. in the manufg. of superconductor devices for engineering applications. Instrumented indentation technique is a powerful tool widely employed to characterize the mech. properties of small vols. We presented results of the nanohardness (H) and Young's modu...
Article
YBa2Cu3O7−x-BaZrO3 (YBCO-BZO) nanocomposites have recently shown to display record pinning forces at high magnetic fields, paving thus the way for power applications. We have applied an ac-susceptibility methodology to analyze the different vortex dynamics of BZO nanocomposites compared to pristine YBCO thin films grown by the trifluoracetate route...
Article
Full-text available
Superconducting welding of bulk YBCO is a key technology allowing the fabrication of large, complex-shaped pieces for applications such as levitation, bearings or large magnets. Ideally, the electrical and mechanical properties of welds should be comparable to that of the joint grains. In this paper, we have investigated the correlation between the...
Article
The anisotropic magnetic properties of the metallic layered compound with hexagonal crystal structure 2H-NbSe2 are investigated as a function of their dependence on high-energy electron irradiation. Pauli paramagnetism of free electrons is shown to dominate the magnetic susceptibility, χp. The anisotropy is related to spin-orbit effects on the hybr...
Article
Magnetic Hall probe microscopy in combination with an inverse problem solver was used to simultaneously determine the intragranular and intergranular critical current density dependences on the applied field of YBCO melt-textured welds with [001]-misorientation angles from 0° to 30°. This methodology enabled us to investigate the pinning mechanisms...
Article
The magnetic properties of 2H-NbSe2, a layered metal with a hexagonal structure of the crystal lattice, are measured, and the change of those properties after irradiation with high-energy electrons is investigated. It is shown that the main part of the magnetic susceptibility comes from the Pauli paramagnetism of free charge carriers. The low-tempe...
Article
A Bean model-based program (“Trazacorrientes”®) has been used to simulate the current distribution in the saturated remanent state of type-II superconducting bicrystal-like squared samples. The grain boundary was modeled by a set of periodically spaced holes geometrically defining the current transparency. Current simulations performed as a functio...
Article
Full-text available
Since the discovery and development of adequate superconducting materials, the development of motors has been a challenge for applications. The basis of design, however, has been the substitution of copper wires by superconducting tapes in coils in order to obtain a higher working field, thus improving power density and efficiency. In the case of h...
Article
The ac susceptibility of a type-II superconducting thin film divided into two halves by a narrow mid region with a smaller value of critical-current density is calculated by a model based on Bean's critical-state model and energy minimization. Results are compared to measurements of ac susceptibility as a function of ac-field amplitude of artificia...
Article
Three half-half jointed melt-textured YBCO rings have been prepared and their ac susceptibility X has been measured at 77 K as a function of field amplitude H and frequency f. All the half rings have their c-axis along the ring axis and there is a nonzero a(b)-axis misalignment angle phi between the two jointed halves. It is found that chi(H-m) is...
Article
We report here on the fabrication and application of novel planar Hall sensors based on shallow InGaP/AlGaAs/GaAs heterostructure with a two-dimensional electron gas (2DEG) as an active layer. The sensors are developed for two kinds of experiments. In the first one, magnetic samples are placed directly on the Hall sensor. Room temperature experimen...
Article
Full-text available
An artificial “multigranular” YBCO thin film has been prepared by patterning a network of gridlines, emulating the current-restricting behavior of grain boundaries. This model system allowed us to investigate the magnetic effects of granularity and current percolation problem, having control on the geometry, number of grains, and ratio of inter-to-...
Article
Full-text available
We have simulated the inductive critical currents and transport currents in the dissipative state of superconducting thin films with an increasing amount of porosity by using a Bean model-based programme (Trazacorrientes®) and finite-element software. Simulations allowed us to find a quantitative, quasi-universal relationship between the overall cr...
Article
The magnetic effects of granularity in YBCO tapes are investigated using model granular systems. Numerical simulations of the field profile, current distribution and AC susceptibility in simple granular configurations have been carried out under a critical-state, magnetic energy minimization approach. Experimentally, an artificially patterned "mult...
Article
The dc and ac magnetic properties of a melt-textured Y Ba <sub>2</sub> Cu <sub>3</sub> O <sub>x</sub> ring with a perpendicular crack is studied. It is found that the crack behaves as a resistively shunted very long Josephson junction. However, besides the expected edge currents, certain inner currents have to occur in the junction. This anomaly ma...