| Records |
| Author |
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 |
| 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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1098-0121 |
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ISI:000254542700117 |
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BT @ hernan @ |
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146 |
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| Author |
Monton, C.; Guimpel, J.; de la Cruz, F. |
| Title |
Superconducting behaviour of Nb/Co superlattices |
Type |
Journal Article |
| Year |
2007 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
254 |
Issue |
1 |
Pages |
375-377 |
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| Abstract |
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 |
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BT @ hernan @ |
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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 |
| Year |
2007 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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| Volume |
75 |
Issue |
6 |
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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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BT @ hernan @ |
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151 |
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| Author |
Bressan, O.J.; Ridner, A.E.; de la Cruz, F. |
| Title |
T^5 law and Matthiessen's rule |
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Journal Article |
| Year |
1975 |
Publication |
Journal of Physics F: Metal Physics |
Abbreviated Journal |
J. Phys. F: Met. Phys. |
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5 |
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3 |
Pages |
481 |
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Precise electrical resistivity measurements on very dilute non magnetic indium alloys show no doubt in a T 5 dependence on temperature between 1-4K and strong deviations from Matthiessen rule. Measurements of thermal resistivity show that the extrapolation method to obtain the data to H=0 is correct. Comparison of the results with recent theories is discussed. |
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0305-4608 |
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no |
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BT @ pedrazp @ |
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547 |
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| Author |
Guimpel, J.; de la Cruz, M.E.; de la Cruz, F.; Fink, H.J.; Laborde, O.; Villegier, J.C. |
| Title |
Size dependence of the Superconducting critical temperature and fields of Nb/Al multilayers |
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Journal Article |
| Year |
1986 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
| Volume |
63 |
Issue |
1-2 |
Pages |
151-165 |
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The critical temperatureT cof Nb/Al multilayers decreases as the total sample thicknessd Tis decreased while the thickness of each Nb and Al layer is kept constant. To understand this behavior, models based on the proximity effect and on weak two-dimensional (2D) localization are employed. The latter uses a characteristic length, the thermal diffusion length, in relation tod Tto obtain 2D behavior and leads to a reasonable explanation ofT c(d T). It is also found that the slope atT c(d T) of the critical magnetic field perpendicular to the layers is independent ofd Twhen the Nb and Al layer thicknesses are kept constant. The angular dependence of the critical field is also measured. |
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0022-2291 |
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ISI:A1986C112200008 |
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no |
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BT @ hernan @ |
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193 |
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| Author |
Bridoux, G.; Nieva, G.; de la Cruz, F. |
| Title |
Phase-coherence effects in vortex transport entropy |
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Journal Article |
| Year |
2008 |
Publication |
PHYSICAL REVIEW LETTERS |
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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 @ |
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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 |
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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 @ |
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198 |
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Correa, V.F.; Nieva, G.; de la Cruz, F. |
| Title |
Vortex softening: Origin of the second peak effect in Bi2Sr2CaCu2O8+delta |
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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 @ |
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215 |
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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 |
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Journal Article |
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2001 |
Publication |
PHYSICAL REVIEW B |
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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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Grigera, S.A.; Morré, E.; Osquiguil, E.; Nieva, G.; De la Cruz, F. |
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Nonlocal transport properties and size effects in heavily twinned YBa2Cu3O7-delta single crystals |
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Journal Article |
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1998 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
107 |
Issue |
7 |
Pages |
335-339 |
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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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0038-1098 |
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ISI:000074907100004 |
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BT @ hernan @ |
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237 |
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