| Records |
| 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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| Volume |
59 |
Issue |
17 |
Pages |
11201-11204 |
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| Abstract |
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 @ |
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231 |
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| Author |
de la Cruz, F.; Fink, H.J.; Luzuriaga, J. |
| Title |
Temperature dependence of the superconducting giant-vortex state. Theory and Experiment |
Type |
Journal Article |
| Year |
1979 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
20 |
Issue |
5 |
Pages |
1947-1959 |
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| Abstract |
When a type-I superconductor with a surface nucleation field Hc3(T)>Hc(T) (thermodynamic critical field) is thermally cycled in an axially applied magnetic field H0 between the temperatures T(Hc3) and about T(Hc), experiments show that the magnetization changes reversibly. The latter is diamagnetic near T(Hc3) but can be paramagnetic just above T(Hc). This behavior is explained by assuming that the fluxoid quantum number b is fixed at the transition from the normal to the superconducting state and retained at lower temperatures. The value of b is determined almost entirely by the flux at the transition which is enclosed by a contour located at a distance ξ1.7 from the surface inside the cylinder (ξ is the coherence length). The temperature variation of the order parameter f at the surface of the cylinder, the magnetization m, and the temperature at which m=0 for f≠0 are calculated for R>>ξ. Conservation of the fluxoid quantum number, while T is varied causes the two opposing surface currents to become imbalanced. This is the source of the observed para- and diamagnetism. |
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0163-1829 |
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ISI:A1979HP51300019 |
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BT @ hernan @ |
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275 |
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| Author |
Osquiguil, E.J.; Civale, L.; Decca, R.; De La Cruz, F. |
| Title |
Metallic to variable-range-hopping transition controlled by oxygen content in La-Sr-Cu-O |
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Journal Article |
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1988 |
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Physical Review B |
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38 |
Issue |
4 |
Pages |
2840-2842 |
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We have performed electrical resistivity measurements on the superconductor La1.8Sr0.2CuO4- over a wide range of temperatures and oxygen concentration. The results provide experimental evidence for a transition from a metallic behavior at high temperatures to a variable-range hopping regime at low temperatures. The transition is controlled by the oxygen content. Correlation between both regimes is also shown. |
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Centro Atmico Bariloche, Instituto Balseiro, 8400 Bariloche, R |
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01631829 (ISSN) |
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Cited By (since 1996): 6; Export Date: 17 April 2009; Source: Scopus; doi: 10.1103/PhysRevB.38.2840; Language of Original Document: English; Correspondence Address: Osquiguil, E.J.; Centro Atmico Bariloche; Instituto Balseiro 8400 Bariloche, R |
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BT @ osquigui @ |
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415 |
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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 |
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1987 |
Publication |
Physical Review B |
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36 |
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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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| Author |
Monton, C.; Guimpel, J.; de la Cruz, F. |
| Title |
Superconducting behaviour of Nb/Co superlattices |
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Journal Article |
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2007 |
Publication |
Applied Surface Science |
Abbreviated Journal |
Appl. Surf. Sci. |
| Volume |
254 |
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1 |
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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 |
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no |
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BT @ hernan @ |
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149 |
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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 |
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1975 |
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Journal of Physics F: Metal Physics |
Abbreviated Journal |
J. Phys. F: Met. Phys. |
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5 |
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3 |
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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 |
de la Cruz, F.; de la Cruz, M.E.; Cotignola, J.M. |
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Efecto magnetomorfico longitudinal en laminas de In |
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Report |
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1968 |
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Informe Tecnico CNEA |
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217 |
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1-16 |
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Buenos Aires |
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0325-1403 |
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no |
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BT @ pedrazp @ |
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545 |
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| Author |
Morré, E.; Grigera, S.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
| Title |
Angular restrictions on the glass transition and on the c-axis correlated liquid phase in twinned YBa2Cu3O7-? |
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Journal Article |
| Year |
1997 |
Publication |
Physics Letters A |
Abbreviated Journal |
Phys. Lett. A |
| Volume |
233 |
Issue |
1-2 |
Pages |
130-134 |
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We have measured the angular dependence of the vortex velocity correlation temperature Tth(H) in twinned YBa2Cu3O7-? single crystals. The data show that the c-axis correlated vortex liquid phase exists up to angles much larger than expected within a single vortex pinning picture. Despite this, the second-order solid-liquid glass transition is shown to be restricted only to external magnetic fields applied within a few degrees from the c-axis direction. |
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Centro Atómico Bariloche |
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03759601 |
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Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Morr |
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no |
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BT @ osquigui @ |
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381 |
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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 |
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1981 |
Publication |
Physica B+C |
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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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no |
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BT @ pedrazp @ |
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530 |
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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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