| Records |
| 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 |
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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451 |
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| Author |
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 |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
1 |
Pages |
83-86 |
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| Abstract |
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 |
Type |
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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| 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 |
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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no |
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BT @ gnieva @ |
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456 |
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| Author |
de la Cruz, F.; López, D.; Righi, E. F.; Nieva, G. |
| Title |
Comparative Study of Vortex Correlation in Twinned and Untwinned YBa2Cu3O7 Single Crystals |
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Conference Article |
| Year |
1996 |
Publication |
Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications |
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Pages |
395 |
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World Scientific Publishing Company |
Place of Publication |
Singapore |
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Batlogg, B. |
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9810227159 |
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no |
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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 |
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Singapore |
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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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| Author |
Righi, E. F.; Grigera, S. A.; Nieva, G.; de la Cruz, F. |
| Title |
Vortex phase coherence along the c axis in YBa2Cu3O7-d |
Type |
Journal Article |
| Year |
1998 |
Publication |
Superconduvtivity Reviews |
Abbreviated Journal |
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2 |
Issue |
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Pages |
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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Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic state modification induced by superconducting response in ferromagnet/superconductor Nb/Co superlattices |
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Journal Article |
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2008 |
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PHYSICAL REVIEW B |
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77 |
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10 |
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Magnetization measurements in superconductor/ferromagnet Nb/Co superlattices show a complex behavior as a function of temperature, applied field, and sample history. Based on a simple model, it is shown that this behavior is due to an interplay between the superconductor magnetization temperature dependence, the ferromagnet magnetization time dependence, and the stray fields of both materials. It is also shown that the magnetic state of the Co layers is modified by the Nb superconducting response, implying that the problem of a superconductor/ferromagnetic heterogeneous sample has to be solved in a self-consistent manner. |
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1098-0121 |
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ISI:000254542700117 |
Approved |
no |
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BT @ hernan @ |
Serial |
146 |
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| Author |
Monton, C.; Guimpel, J.; de la Cruz, F. |
| Title |
Superconducting behaviour of Nb/Co superlattices |
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Journal Article |
| Year |
2007 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
254 |
Issue |
1 |
Pages |
375-377 |
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We study the superconducting and magnetic behaviour of Nb/Co superlattices, for superconducting Nb layer thickness of 44 nm and Co layer thickness less than 1 nm. In this limit no ferromagnetism is observed for Co. The superlattice behaves as independent superconducting Nb layers. We obtain the penetration depth and superconducting gap of the material, and analyze the results in terms of microscopic models and theories. (C) 2007 Elsevier B.V. All rights reserved. |
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0169-4332 |
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ISI:000250800100085 |
Approved |
no |
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BT @ hernan @ |
Serial |
149 |
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| Author |
Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic behavior of superconductor/ferromagnet superlattices |
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Journal Article |
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2007 |
Publication |
PHYSICAL REVIEW B |
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75 |
Issue |
6 |
Pages |
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A study of the electromagnetic response of superconductor/ferromagnet Nb/Co superlattices is presented. The dc magnetization is measured as a function of Co layer thickness, applied field H-a, and temperature. For very thin Co layers, no ferromagnetism is detected and the observed response is essentially that of a collection of uncoupled Nb layers. When the Co layer is thick enough for ferromagnetism to be established, prior to the field-cooled magnetization measurements, the Co layers are magnetically saturated in the parallel or antiparallel directions to H-a. In this case, the magnetic response of the otherwise uncoupled Nb layers is found to depend on both H-a and the stray fields. |
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1098-0121 |
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ISI:000244533000075 |
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no |
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BT @ hernan @ |
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151 |
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