| Records |
| Author |
Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic state modification induced by superconducting response in ferromagnet/superconductor Nb/Co superlattices |
Type |
Journal Article |
| Year |
2008 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal  |
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| Volume |
77 |
Issue |
10 |
Pages |
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| Abstract |
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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| ISSN |
1098-0121 |
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ISI:000254542700117 |
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no |
| Call Number |
BT @ hernan @ |
Serial |
146 |
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| Author |
Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic behavior of superconductor/ferromagnet superlattices |
Type |
Journal Article |
| Year |
2007 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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| Volume |
75 |
Issue |
6 |
Pages |
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| Abstract |
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 @ |
Serial |
151 |
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| Author |
Bridoux, G.; Nieva, G.; de la Cruz, F. |
| Title |
Phase-coherence effects in vortex transport entropy |
Type |
Journal Article |
| Year |
2008 |
Publication |
PHYSICAL REVIEW LETTERS |
Abbreviated Journal |
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| Volume |
101 |
Issue |
11 |
Pages |
117002 |
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Nernst and electrical resistivity measurements in superconducting YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta with and without columnar defects show a distinctive thermodynamics of the respective liquid vortex matter. At a field-dependent high temperature region in the H-T phase diagram, the Nernst signal is independent of structural defects in both materials. At lower temperatures, in YBa2Cu3O7-delta, defects contribute only to the vortex mobility, and the transport entropy is that of a system of vortex lines. The transition to lower temperatures in Bi2Sr2CaCu2O8+delta has a different origin; the maximum in the Nernst signal when decreasing temperature is not associated with transport properties but with the entropy behavior of pancake vortices in the presence of structural defects. |
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0031-9007 |
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ISI:000259188700052 |
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no |
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BT @ hernan @ |
Serial |
195 |
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| Author |
Bridoux, G.; Pedrazzini, P.; de la Cruz, F.; Nieva, G. |
| Title |
Angular field dependence of the Nernst effect in Bi2Sr2CaCu2O8+delta |
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Journal Article |
| Year |
2007 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
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460 |
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841-842 |
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The anomalous Nernst effect in hole-doped cuprates has been interpreted in terms of the existence of a superconducting order parameter well above the transition temperature, T-c(H). In order to improve the understanding of this problem, we have measured the angular field dependence of the Nernst signal in Bi2Sr2CaCu2O8+delta single crystals. The experiment was done tilting the magnetic field with respect to the direction of the temperature gradient, above and below T,(H), with applied fields up to 16 T. We have found that all the curves are scaled on one curve against the reduced field Hcos theta at a fixed temperature. (c) 2007 Elsevier B.V. All rights reserved. |
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0921-4534 |
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ISI:000249870600060 |
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no |
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BT @ hernan @ |
Serial |
198 |
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| Author |
Correa, V.F.; Nieva, G.; de la Cruz, F. |
| Title |
Vortex softening: Origin of the second peak effect in Bi2Sr2CaCu2O8+delta |
Type |
Journal Article |
| Year |
2001 |
Publication |
PHYSICAL REVIEW LETTERS |
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| Volume |
87 |
Issue |
5 |
Pages |
057003 |
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Magnetic hysteresis and transverse ac permeability measurements in Bi2Sr2CaCu2O8+delta allow a comparative analysis of the critical current with the elastic response of vortex structures, in equilibrium with their pinning potential, in the field and temperature region where the second peak is detected. This study provides strong evidence that the second peak has its origin in changes of the elastic equilibrium properties of the vortex structures. |
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0031-9007 |
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ISI:000170212200049 |
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no |
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BT @ hernan @ |
Serial |
215 |
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| Author |
Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. |
| Title |
Order-disorder transition and the zero-dimensional vortex pinning regime in Bi2Sr2CaCu2O8+delta |
Type |
Journal Article |
| Year |
2001 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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| Volume |
63 |
Issue |
9 |
Pages |
092502 |
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We make a comparative study between the ab plane's dc critical current and the ac transverse magnetic permeability μ(perpendicular to) in the Campbell limit for optimally doped and overdoped Bi2Sr2CaCu2O8+delta samples. We focus attention on the low-temperature region [T/T-c(0) < 0.25], where the transition to the zero-dimensional Larkin limit is detected by the critical current as well as by a rapid change of the Labusch parameter with temperature. The order-disorder transition, characterized by the second peak in magnetization, disappears in the presence of this zero-dimensional pinning regime. |
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0163-1829 |
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ISI:000167312000016 |
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no |
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BT @ hernan @ |
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218 |
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| Author |
Esquinazi, P.; de la Cruz, M.E.; de la Cruz, F. |
| Title |
Heat treatment effects in La70Cu30 amorphous system |
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Journal Article |
| Year |
1981 |
Publication |
Physica B+C |
Abbreviated Journal |
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108B |
Issue |
1-3 |
Pages |
1215-1216 |
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It is shown that superconductivity is a useful tool to investigate the evolution of the amorphous state, when heat treatment below the crystallization temperature. |
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0378-4363 |
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BT @ pedrazp @ |
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530 |
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| Author |
De La Cruz, F.; Luzuriaga, J.; Martinez, E.N.; Osquiguil, E.J. |
| Title |
Current-voltage characteristics in collective pinning |
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Journal Article |
| Year |
1987 |
Publication |
Physical Review B |
Abbreviated Journal |
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| Volume |
36 |
Issue |
13 |
Pages |
6850-6852 |
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The critical-current curves of amorphous samples which exhibit collective flux pinning have been analyzed, and it was found that the nonlinear part can be fitted by an expression of the form V(I)[(I-IK)/IK]. This form, which could be due to critical behavior, is consistent with an interpretation of the unpinning of vortices in the collective regime as a phase transition between the static flux-line lattice (FLL) and the FLL in steady-state movement as has been proposed by Fisher. |
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Centro Atomico Bariloche, Instituto Balseiro, 8400 Bariloche, Argentina |
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01631829 (ISSN) |
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Cited By (since 1996): 2; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.36.6850; Language of Original Document: English; Correspondence Address: De La Cruz, F.; Centro Atomico Bariloche; Instituto Balseiro 8400 Bariloche, Argentina |
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BT @ osquigui @ |
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417 |
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Osquiguil, E.; Civale, L.; Decca, R.; Safar, H.; Martinez, E.; Nieva, G.; de la Cruz, F. |
| Title |
The Granular Behavior of LaSrCuO: Oxygen Concentration Effects on the Electrical Resistivity |
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Book Chapter |
| Year |
1988 |
Publication |
High Temperature Superconductors, Mat. Res. Soc. Symposium Proceedings |
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99 |
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985 |
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Mater. Res. Soc. |
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Pittsburgh, PA |
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ed. M.B. Brosdky, R. C. Dynes, K. Kitazawa and H. L. Tutler |
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BT @ gnieva @ |
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431 |
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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 |
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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 |
Place of Publication |
Singapore |
Editor |
Batlogg, B. |
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9810227159 |
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BT @ gnieva @ |
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461 |
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