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Author Morré, E.; Grigera, S.; Osquiguil, E.; Nieva, G.; de la Cruz, F.
Title Angular restrictions on the glass transition and on the c-axis correlated liquid phase in twinned YBa2Cu3O7-? Type Journal Article
Year 1997 Publication Physics Letters A Abbreviated Journal (up) Phys. Lett. A
Volume 233 Issue 1-2 Pages 130-134
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Abstract We have measured the angular dependence of the vortex velocity correlation temperature Tth(H) in twinned YBa2Cu3O7-? single crystals. The data show that the c-axis correlated vortex liquid phase exists up to angles much larger than expected within a single vortex pinning picture. Despite this, the second-order solid-liquid glass transition is shown to be restricted only to external magnetic fields applied within a few degrees from the c-axis direction.
Address Centro Atómico Bariloche
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ISSN 03759601 ISBN Medium
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Notes Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Morr Approved no
Call Number BT @ osquigui @ Serial 381
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Author López, D.; Jagla, E. A.; Righi, E. F.; Osquiguil, E.; Nieva, G.; Morré, E.; de la Cruz, F.; Balseiro, C. A.
Title Dynamic softening of vortex lines in YBa2Cu3O7−δ single crystals Type Journal Article
Year 1996 Publication Physica C: Superconductivity Abbreviated Journal (up) Physica C
Volume 260 Issue 3-4 Pages 211-216
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Abstract Transport measurements in the mixed state of oxygen-deficient YBa2Cu3O7−δ single crystals using the flux transformer configuration show that the flux liquid changes with increasing anisotropy from strongly correlated to uncorrelated in the field direction. For intermediate coupling, the current inducing loss of vortex correlation has a maximum near the irreversibility temperature. Thus, an effective softening of vortex lines with decreasing temperature is detected. We propose a simple model that accounts for this behavior by including the effects of the pinning potential on the dynamics of vortices.
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Call Number BT @ gnieva @ Serial 454
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Author Grigera, S.A.; Morré, E.; Osquiguil, E.; Nieva, G.; De la Cruz, F.
Title Nonlocal transport properties and size effects in heavily twinned YBa2Cu3O7-delta single crystals Type Journal Article
Year 1998 Publication Solid State Communications Abbreviated Journal (up) Solid State Commun.
Volume 107 Issue 7 Pages 335-339
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Abstract We demonstrate experimentally that when the vortex correlation length in the liquid state becomes of the order of the sample thickness, size effects dominate the transport properties of the macroscopic vortex structures, implying a nonlocal response in the transformer experiments.
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ISSN 0038-1098 ISBN Medium
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Notes ISI:000074907100004 Approved no
Call Number BT @ hernan @ Serial 237
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