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| Author |
de la Cruz, F.; Maloney, M.D.; Cardona, M. |
| Title |
Supercooling and superheating in Al and Zn |
Type |
Journal Article |
| Year |
1971 |
Publication  |
Physica |
Abbreviated Journal |
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| Volume |
55 |
Issue |
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Pages |
749-759 |
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| Abstract |
We have studied the supercooling and superheating of Al and Zn in the temperature range between 0.5 and 1.2 K. The samples, collections of dispersed and isolated small spheres, were prepared by spraying of the molten metal into liquid nitrogen. The supercooling and superheating fields obtained are, by all indications, close to the theoretical limit. From the supercooling fields observed we determined the Ginzburg-Landau parameter κ(Tc) = 0.015, for both Al and Zn. The superheating field exhibits a strong temperature dependence near Tc, which reflects the extremely non-local electrodynamics of the materials. The results are discussed in the light of recent theoretical work. |
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0031-8914 |
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no |
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BT @ pedrazp @ |
Serial |
809 |
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| Author |
Esquinazi, P.; de la Cruz, M.E.; de la Cruz, F. |
| Title |
Heat treatment effects in La70Cu30 amorphous system |
Type |
Journal Article |
| Year |
1981 |
Publication |
Physica B+C |
Abbreviated Journal |
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| Volume |
108B |
Issue |
1-3 |
Pages |
1215-1216 |
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| Abstract |
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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| ISSN |
0378-4363 |
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no |
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BT @ pedrazp @ |
Serial |
530 |
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| Author |
Arce, R.; de la Cruz, F.; Esquinazi, P. |
| Title |
Superconducting penetration depth in amorphous La70Cu30 |
Type |
Journal Article |
| Year |
1981 |
Publication |
Physica B+C |
Abbreviated Journal |
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| Volume |
108B |
Issue |
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Pages |
1253-1254 |
| Keywords |
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| Abstract |
It is shown that weak field penetration depth measurements can be used to determine the change in the normal and superconducting behaviour of amorphous samples, when heat-treated below the crystallization temperature. The results are used to discuss the validity of BCS-Gorkov relations, when applied to these materials. |
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Proceedings of LT-16 |
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no |
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BT @ pedrazp @ |
Serial |
558 |
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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 |
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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no |
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BT @ gnieva @ |
Serial |
442 |
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| Author |
Correa, V.F.; Nieva, G.; Pastoriza, H.; de la Cruz, F. |
| Title |
The true pinning force range in Bi2Sr2CaCu2O8 single crystals at low temperatures |
Type |
Journal Article |
| Year |
2004 |
Publication |
Physica C |
Abbreviated Journal |
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| Volume |
408-410 |
Issue |
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Pages |
531-532 |
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| Abstract |
We study the effective profile of the pinning potential well in Bi$2$Sr$2$CaCu$_2$O8+δ single crystals using transverse ac magnetic susceptibility. The results show that the harmonic approximation for the potential well (linear regime) is valid up to vortex displacements $r\simeqξ$, where ξ, is the coherence length. In spite of this, it is necessary to induce displacements of the vortex structure much larger than ξ to depin it from its potential. This is shown to take place even in the single vortex limit. |
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no |
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BT @ hernan @ correa04 |
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9 |
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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 |
Type |
Journal Article |
| Year |
2007 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
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| Volume |
460 |
Issue |
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Pages |
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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| Notes |
ISI:000249870600060 |
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no |
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BT @ hernan @ |
Serial |
198 |
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| Author |
Grigera, S.A.; Grigera, T.S.; Righi, E.F.; Nieva, G.; de la Cruz, F. |
| Title |
Flux-cutting in YBa2Cu3O7-delta revisited |
Type |
Journal Article |
| Year |
2002 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
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| Volume |
371 |
Issue |
3 |
Pages |
237-242 |
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In this paper we present an analysis of the response of the vortices in YBa2Cu3O7-delta to different configurations of applied driving forces. The use of inhomogeneous current allows us to induce vortex cutting. We determine the maximum current injected in different electrical contact distributions which preserves vortex integrity, and we show that vortex cutting cannot be explained by a single vortex picture. (C) 2001 Elsevier Science B.V. All rights reserved. |
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0921-4534 |
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ISI:000176131500007 |
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no |
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BT @ hernan @ |
Serial |
212 |
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Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. |
| Title |
Onset of the 0-dimensional vortex pinning behavior in the optimally doped and overdoped Bi2Sr2CaCu2O8+delta system |
Type |
Journal Article |
| Year |
2000 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
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| Volume |
341 |
Issue |
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Pages |
1285-1286 |
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We report results of transverse AC magnetic permeability in the linear regime and DC magnetization loops for optimally doped and oxygen overdoped samples of Bi2Sr2CaCu2O8+delta The data cover the low temperature (T < 25K) and low held (H-a < 1000 Oe) region of the magnetic (H-a-T) phase diagram. In optimally doped as well as in overdoped samples a crossover to a O-dimensional pinning regime (Larkin length, L-C(C), shorter than the inter-plane CuO2 distance) is observed at a characteristic temperature Too for all investigated fields. The order-disorder transition, identified by the second peak in magnetization and a non monotonous field dependence of the AC penetration depth, is quenched below T-0D. |
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0921-4534 |
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ISI:000165855700242 |
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no |
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BT @ hernan @ |
Serial |
221 |
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| Author |
Rodríguez, E.; Duran, C.; Luzuriaga, J.; de la Cruz, F.; Fainstein, C. |
| Title |
Anomalous behaviour of the vortex structure in Bi4Ca2Sr4Cu4O16+y measured with a vibrating reed at low magnetic fields |
Type |
Journal Article |
| Year |
1990 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
165 |
Issue |
3-4 |
Pages |
315-320 |
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The response of the vortex structure in ceramic samples of Bi4Ca2Sr4Cu4O16+y has been measured by means of a vibrating reed technique in magnetic fields below 0.2 T. An anomally in the response of the reed is seen at temperatures of around 30 to 40 K, well below the critical temperature, indicating a transition similar to that attributed to a melting of the Flux Line Lattice. There is a shift in the temperature at which the anomaly is detected when one increases the driving force on the reed, while the dissipation shows a maximum associated to the transition which scales with the square of the applied magnetic field. Comparison with magnetization measurements shows that there is non-zero critical current at the same temperature where the anomalous behaviour is detected with our technique. |
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0921-4534 |
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ISI:A1990CN49800014 |
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no |
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BT @ hernan @ |
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261 |
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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 |
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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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no |
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BT @ gnieva @ |
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450 |
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