| Records |
| 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 |
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Journal Article |
| Year |
1996 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
| Volume |
76 |
Issue |
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Pages |
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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448 |
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Safar, H.; Lopez, D.; Gammel, P.L.; Huse, D.A.; Majumdar, S.N.; Schneemeyer, L.F.; Bishop, D.J.; Nieva, G.; de la Cruz, F. |
| Title |
Experimental evidence of a non-local resistivity in a vortex line liquid |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
4 |
Pages |
2581-2582 |
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We present transport measurements on YBCO single crystals in the vortex liquid regime using the DC flux transformer geometry. We show that the data are inconsistent with the material being an anisotropic, local conductor. The results provided evidence for non-local transport which indicate that there can be correlated vortex motion over macroscopic distances in this system. We have shown that this correlated vortex motion can be destroyed by either thermal fluctuations or the applications of large driving forces. |
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450 |
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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 |
2575-2576 |
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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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BT @ gnieva @ |
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451 |
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de la Cruz, F.; Pastoriza, H.; López, D.; Goffman, M. F.; Arribére, A.; Nieva, G. |
| Title |
Consequences of 3D-2D vortex decoupling on the phase diagram of HTS |
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Journal Article |
| Year |
1994 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
1 |
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83-86 |
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We discuss the quench of the long range order in the direction parallel and perpendicular to the field, in the mixed state of BSCCO(2212) and YBCO(123) single crystals. The experimental data show that the high temperature vortex phase in both systems is an uncorrelated liquid phase in all directions. |
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BT @ gnieva @ |
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453 |
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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 |
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Journal Article |
| Year |
1996 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
260 |
Issue |
3-4 |
Pages |
211-216 |
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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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BT @ gnieva @ |
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454 |
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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 |
773 - 786 |
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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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BT @ gnieva @ |
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456 |
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de la Cruz, F.; López, D.; Righi, E. F.; Nieva, G. |
| Title |
Comparative Study of Vortex Correlation in Twinned and Untwinned YBa2Cu3O7 Single Crystals |
Type |
Conference Article |
| Year |
1996 |
Publication |
Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications |
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395 |
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World Scientific Publishing Company |
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Singapore |
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Batlogg, B. |
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9810227159 |
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BT @ gnieva @ |
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461 |
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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 |
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Issue |
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Pages |
411 |
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World Scientific Publishing Company |
Place of Publication |
Singapore |
Editor |
Batlogg, B. |
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9810227159 |
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no |
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BT @ gnieva @ |
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462 |
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Righi, E. F.; Grigera, S. A.; Nieva, G.; de la Cruz, F. |
| Title |
Vortex phase coherence along the c axis in YBa2Cu3O7-d |
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Journal Article |
| Year |
1998 |
Publication |
Superconduvtivity Reviews |
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2 |
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205 |
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1054-2698 |
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no |
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BT @ gnieva @ |
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465 |
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Arce, R.; de la Cruz, F.; Fink, H.J. |
| Title |
Model relating superconductive penetration depth and metallurgical phase separation in amorphous La70Cu30 |
Type |
Journal Article |
| Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
42 |
Issue |
8 |
Pages |
575-577 |
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A model is proposed to account for the large increase in the measured penetration depth of superconducting, amorphous La70Cu30 when the specimens are annealed sufficiently long near, but below, the crystallization temperature. It is suggested that a metallurgical phase separation occurs with domain dimensions in the submicrometer range. Penetration depth measurements as a function of temperature in a weak magnetic field are a useful tool to detect changes in phase separation in high-K materials. |
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0038-1098 |
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BT @ pedrazp @ |
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567 |
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