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E. Bartolomé

Spanish National Research Council

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Featured researches published by E. Bartolomé.

Superconductor Science and Technology | 2007

Universal correlation between critical current density and normal-state resistivity in porous YBa2Cu3O7−x thin films

E. Bartolomé; Fedor Gömöry; X. Granados; T. Puig; X. Obradors

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 critical current density and the normal-state resistivity via the sample porosity. This theoretical curve served to fit the experimental data found for a large number (~150) of epitaxial YBa2Cu3O7−x thin films grown by the trifluoracetate route.

Applied Physics Letters | 2007

Magnetic properties of a melt-textured YBa2Cu3Ox ring with a perpendicular crack

D.-X. Chen; Enric Pardo; Alvaro Sanchez; E. Bartolomé; T. Puig; X. Obradors

The dc and ac magnetic properties of a melt-textured YBa2Cu3Ox 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 may be a general feature of a very long junction with similar values of Josephson and London penetration depths, which is a case not yet studied theoretically.

Superconductor Science and Technology | 2008

Vortex pinning regimes in YBa2Cu3O7−x bulk boundaries investigated by quantitative magnetic Hall microscopy

E. Bartolomé; B Bozzo; X. Granados; F. Sandiumenge; T. Puig; X. Obradors

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 of grain boundary vortices, which evolve from Abrikosov vortices (AVs) to Abrikosov?Josephson vortices (AJVs) and then to Josephson vortices (JVs) as the angle increases. We present a magnetic field versus grain boundary angle phase diagram at 77?K in which different intergrain vortex motion regimes can be identified.

Physical Review B | 2005