| Records |
Author  |
Ferrari, H.; Valenzuela, S.O.; Bekeris, V.; Guimpel, J.; de la Cruz, F. |
| Title |
Short-time magnetization in superconducting thin films |
Type |
Journal Article |
| Year |
1998 |
Publication |
REVISTA MEXICANA DE FISICA |
Abbreviated Journal |
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| Volume |
44 |
Issue |
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Pages |
193-195 |
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| Abstract |
We have investigated the magnetization in thin (Y;Gd)Ba2Cu3O7-delta superconducting films in the 100 μs time scale. Magnetic moment was measured with a non-conventional technique that combines the use of a pulsed magnetic field and a synchronized pulsed laser. Both virgin and magnetically cycled samples were examined and results are described within Bean's critical state model. |
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0035-001X |
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ISI:000077675900051 |
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BT @ hernan @ |
Serial |
182 |
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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 |
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| Volume |
371 |
Issue |
3 |
Pages |
237-242 |
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| Abstract |
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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| Author |
Grigera, S.A.; Morre, E.; Osquiguil, E.; Balseiro, C.; Nieva, G.; de la Cruz, F. |
| Title |
Bose-glass phase in twinned YBa2Cu3O7-delta |
Type |
Journal Article |
| Year |
1998 |
Publication |
PHYSICAL REVIEW LETTERS |
Abbreviated Journal |
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| Volume |
81 |
Issue |
11 |
Pages |
2348-2351 |
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| Abstract |
Using an extensive scaling analysis of the transport properties in twinned YBa2Cu3O7-delta crystals we have experimentally found the predicted change in the universality class of the Bose-glass to liquid transition when the magnetic field is applied at small angles away from the direction of the correlated defects. The new dynamical critical exponent is s' = 1.1 +/- 0.3. |
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0031-9007 |
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ISI:000075897300042 |
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no |
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BT @ hernan @ |
Serial |
235 |
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| Author |
Grigera, S.A.; Morre, E.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
| Title |
Two-step liquid-solid vortex transition with the field along the ab planes in YBa2Cu3O7-delta crystals |
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Journal Article |
| Year |
1999 |
Publication |
PHYSICAL REVIEW B |
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59 |
Issue |
17 |
Pages |
11201-11204 |
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Resistivity measurements for different Lorentz force configurations and the detection of the longitudinal vortex velocity correlation length, with the magnetic field applied parallel to the ab planes, in the mixed state of clean and twinned YBa2Cu3O7-delta single crystals,' support the existence of a vortex-smectic phase when the vortices interact with an attractive periodic potential. The transition from the vortex-liquid to the vortex-solid state is shown to be achieved in two steps, a continuous transition from a liquid to a possible smectic phase and another continuous one from the smectic phase to a solid. [S0163-1829(99)09413-8]. |
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0163-1829 |
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ISI:000084631900027 |
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no |
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BT @ hernan @ |
Serial |
231 |
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| Author |
Grigera, S.A.; Morré, E.; Osquiguil, E.; Nieva, G.; De la Cruz, F. |
| Title |
Nonlocal transport properties and size effects in heavily twinned YBa2Cu3O7-delta single crystals |
Type |
Journal Article |
| Year |
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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| ISSN |
0038-1098 |
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ISI:000074907100004 |
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no |
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BT @ hernan @ |
Serial |
237 |
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| Author |
Guimpel, J.; Civale, L.; de la Cruz, F.; Murduck, J.M.; Schuller, I.K. |
| Title |
Dimensional phase transition in superconductors with short coherence length |
Type |
Journal Article |
| Year |
1988 |
Publication |
Physical Review B |
Abbreviated Journal |
PRB |
| Volume |
38 |
Issue |
4 |
Pages |
2342-2344 |
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| Abstract |
We found a novel dimensional transition in the vortex lattice of a finite-sized superconductor. The low-field dependence (with field applied parallel to the film plane) of the magnetization exhibits two maxima, which signal the transition from one to two dimensions. In one dimension the vortices line up along the film, and with increasing field their arrangement changes into a two-dimensional array due to the competition between vortex-surface and vortex-vortex repulsion. Agreement is found with no adjustable parameter calculations using a priori known surface-barrier and vortex-repulsion effects. |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.38.2342 |
Serial |
539 |
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| Author |
Guimpel, J.; de la Cruz, F. |
| Title |
Electrical resistivity of amorphous Zr70Cu30 and the Kondo like model |
Type |
Journal Article |
| Year |
1982 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
44 |
Issue |
7 |
Pages |
1045-1046 |
| Keywords |
Zr70Cu30; superconductivity; electrical resistivity; ZIRCONIUM COPPER ALLOYS |
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Electrical resistivity measurements of amorphous Zr70Cu30 as a function of the concentrations of two level systems show that a Kondo like theory cannot explain the observed temperature dependence. |
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0038-1098 |
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BT @ pedrazp @ |
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540 |
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Guimpel, J.; de la Cruz, F.; Murduck, J.; Schuller, I.K. |
| Title |
Penetration depth of a superconducting superlattice |
Type |
Journal Article |
| Year |
1987 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
35 |
Issue |
7 |
Pages |
3655-3656 |
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| Abstract |
We have measured the magnetic-flux expulsion of a superconducting superlattice and related it to the Meissner penetration depth. The temperature dependence of the penetration depth is in quantitative agreement with theoretical expectation based on mean-field theory. The zero-temperature penetration depth is found in excellent, quantitative agreement without adjustable parameters with theoretical predictions for dirty superconductors. |
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American Physical Society |
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Rapid Communications |
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no |
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BT @ pedrazp @ 10.1103/PhysRevB.35.3655 |
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538 |
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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 |
Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F. |
| Title |
Magnetic behaviour of superconductor/ferromagnet metallic and perovskite based superlattices |
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Journal Article |
| Year |
2007 |
Publication |
physica status solidi (c) |
Abbreviated Journal |
Phys. Status Solidi (c) |
| Volume |
4 |
Issue |
11 |
Pages |
4174-4180 |
| Keywords |
74.45.+c; 74.78.Fk; 75.70.Cn |
| Abstract |
We present a study of the magnetic behaviour of superconducting/ferromagnetic superlattices, both for metallic and perovskite based systems. In the first case we find that the response is determined by the ferromagnetic layer regime. If these layers are very thin, no ferromagnetism is observed, but the superconducting layers are decoupled, and the superlattice behaves as a stack of independent superconducting films. For thicker ferromagnetic films, ferromagnetism is established and the effective field resulting from the superposition of stray and applied fields dominates the superconducting response of the superlattice. For the perovskite based superlattices, the physical properties are more affected by interface disorder. In this case we have found that the behaviour can be interpeted as charge carrier transfer between both materials, inducing a change in the magnetic character of the manganite. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) |
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WILEY-VCH Verlag |
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1610-1642 |
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BT @ jguimpel @ |
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620 |
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