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Author Pérez-Morelo, D.J.; Osquiguil, E.; Kolton, A.B.; Nieva, G.; Jung, I.W.; López, D.; Pastoriza, H.
Title Thermodynamic evidence for the Bose glass transition in twinned YBa2Cu3O7-δ crystals Type Journal Article
Year 2015 Publication Physical Review B Abbreviated Journal PRB
Volume 92 Issue 2 Pages (down) 020510
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Abstract We used a micromechanical torsional oscillator to measure the magnetic response of a twinned YBa2Cu3O7−δ single crystal disk near the Bose glass transition. We observe an anomaly in the temperature dependence of the magnetization consistent with the appearance of a magnetic shielding perpendicular to the correlated pinning of the twin boundaries. This effect is related to the thermodynamic transition from the vortex liquid phase to a Bose glass state.
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Publisher American Physical Society Place of Publication Editor
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Call Number BT @ hernan @ 10.1103/PhysRevB.92.020510 Serial 717
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Author López, D.; Nieva, G.; de la Cruz, F.; Jensen, Henrik Jeldtoft; O’Kane, Dominic
Title Flux cutting in YBa2Cu3O7-δ single crystals: Experiment and phenomenological model Type Journal Article
Year 1994 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 50 Issue Pages (down) 9684
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Abstract We measured the current-induced loss of vortex correlation in YBa2Cu3O7-δ crystals using the pseudo-dc-flux-transformer geometry. We find that the current density Jcut at which the top and bottom voltage drops differ is a linear function of temperature, is independent of pinning, and depends on the thickness of the sample. This thickness dependence strongly suggests that the electrical current flows at the surface of the sample. The observed behavior with temperature, magnetic field, and thickness is described by a phenomenological model.
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Call Number BT @ gnieva @ Serial 445
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Author López, D.; Nieva, G.; de la Cruz, F.
Title In- and out-of-plane vortex correlations in YBa2Cu3O7 Type Journal Article
Year 1994 Publication Physical Review B Abbreviated Journal Phys. Rev. B
Volume 50 Issue Pages (down) 7219
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Call Number BT @ gnieva @ Serial 444
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Author López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.
Title Coincidence of Vortex-Lattice Melting and Loss of Vortex Correlation along the c Direction in Untwinned YBa2Cu3O7-δ Single Crystals Type Journal Article
Year 1996 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.
Volume 76 Issue Pages (down) 4034
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Abstract We report on transport measurements using the dc flux transformer configuration in clean and twinned single crystals of YBa2Cu3O7-δ. We show that correlated disorder changes not only the order of the solid-liquid phase transition but also the nature of the vortices in the liquid state. In clean crystals, melting is shown to take place between a solid of vortex lines and a liquid with no correlation in the direction of the magnetic field.
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Call Number BT @ gnieva @ Serial 448
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Author López, D.; Nieva, G.; de la Cruz, F.
Title Long range correlations of the vortex structure in YBCO single crystals Type Journal Article
Year 1994 Publication Physica C: Superconductivity Abbreviated Journal Physica C
Volume 235-240 Issue 4 Pages (down) 2575-2576
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Abstract Transport measurements in the mixed state of YBa2Cu3O7 single crystals using the “DC flux transformer” configuration show that the glass-liquid phase transition at the irreversibility line, TI(H), behaves as a three dimensional vortex phase transition. These results together with resistance measurements in the c direction show that the vortex correlation across the sample is destroyed at a temperature Tth(H), higher than TI(H). The sample thickness dependence of Tth(H) suggest that in the real thermodynamic phase transition (infinite sample), the long range correlation in the ab plane as well in the c direction is lost at the single temperature TI(H).
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Call Number BT @ gnieva @ Serial 451
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Author López, D.; Safar, H.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Nieva, G.; de la Cruz, F.
Title Reply to the Comment: Local versus Non-Local Conductivity in YBa2Cu3O7-d Type Journal Article
Year 1995 Publication Physical Review Letters Abbreviated Journal Phys. Rev. Lett.
Volume 75 Issue Pages (down) 2447
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Abstract A Reply to the Comment by Yu. Eltsev and O. Rapp.
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Call Number BT @ gnieva @ Serial 446
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Author López, D.; Rodríguez, E.; Nieva, G.; de la Cruz, F.; Cheong, S. W.
Title Three-dimensional vortex flux flow in LSCO and YBCO through pseudo dc flux transformer measurements Type Journal Article
Year 1994 Publication Physica B: Condensed Matter Abbreviated Journal Physica B
Volume 194-196 Issue 2 Pages (down) 1977-1978
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Abstract A pseudo dc flux transformer configuration shows that the flux flow in La2−xSrxCuO4 (x=0.075) and YBa2Cu3O7 single crystals is due to the movement of 3-D vortices across the sample. We show that the loss of c-axis long range vortex correlation is achieved either by thermal fluctuations or by an inhomogeneus Lorentz force acting on the vortices.
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Call Number BT @ gnieva @ Serial 442
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Author López, D.; Decca, R.; de la Cruz, F.
Title Topological pinning and flux flow in ceramic superconductors Type Journal Article
Year 1991 Publication Solid State Communications Abbreviated Journal
Volume 79 Issue 11 Pages (down) 959-962
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Abstract The transport current dissipation in the high Tc superconducting ceramic La1.85Sr0.15CuO4−δ shows a sin2 Θ voltage dependence where Θ is the angle between the transport current and the magnetic field. This result and the experimental evidence of an angle independent critical current cannot be explained by the conventional description of flux motion in homogeneous type II superconductors. The results are analyzed in the framework of a granular system where pinning is induced by the topological distribution of current flowing through a multiply connected medium. The dissipation in the superconducting state is found to be due to two additive contributions, one induced by the movement of magnetic flux and the other associated to dissipation in the Josephson junction.
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ISSN 0038-1098 ISBN Medium
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Call Number BT @ pedrazp @ Serial 808
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Author de la Cruz, F.; López, D.; Nieva, G.
Title Thermally induced change in the vortex dimensionality of YBa2Cu3O7 single crystals Type Journal Article
Year 1994 Publication Philosophical Magazine Part B Abbreviated Journal Philos. Mag. B
Volume 70 Issue 3 Pages (down) 773 - 786
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Abstract Transport measurements in YBa2Cu3O7 single crystals using a modification of the d.c. flux transformer configuration are reported. We show that, for applied magnetic fields in the crystallographic c direction, the vortex correlation length in this direction is reduced to values smaller than the thickness of the sample. The reduction can be induced either by thermal disorder (linear response) or by flux cutting after the vortices reach a critical velocity (nonlinear response). The results show that, in the transition from a vortex-glass state to a vortex-liquid state, the vortices are effectively three dimensional in character. A two-dimensional regime is induced at higher temperatures well inside the reversibility region.
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Call Number BT @ gnieva @ Serial 456
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Author López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.; Kwok, W. K.; Fendrich, J. A.; Crabtree, G. W.; Paulius, L.
Title Discontinuous Onset of the c-axis Vortex Correlation at the Melting Transition in YBa2Cu3O7 Type Conference Article
Year 1996 Publication Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications Abbreviated Journal
Volume Issue Pages (down) 411
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Publisher World Scientific Publishing Company Place of Publication Singapore Editor Batlogg, B.
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ISSN ISBN 9810227159 Medium
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Call Number BT @ gnieva @ Serial 462
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