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Osquiguil, E.J.; Civale, L.; Decca, R.; De La Cruz, F. |
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Title |
Metallic to variable-range-hopping transition controlled by oxygen content in La-Sr-Cu-O |
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1988 |
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Physical Review B |
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38 |
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4 |
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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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415 |
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de la Cruz, F.; Maloney, M.D.; Cardona, M. |
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Title |
Supercooling and superheating in Al and Zn |
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Journal Article |
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1971 |
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Physica |
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55 |
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749-759 |
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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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BT @ pedrazp @ |
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809 |
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Duran, C.; Yazyi, J.; de la Cruz, F.; Bishop, D.J.; Mitzi, D.B.; Kapitulnik, A. |
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Title |
Flux-lattice melting, anisotropy, and the role of interlayer coupling in Bi-Sr-Ca-Cu-O single crystals |
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Journal Article |
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1991 |
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Physical Review B |
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PRB |
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44 |
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14 |
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7737-7740 |
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We have used the high-Q mechanical-oscillator technique to probe the vortex-lattice structure in high-quality Bi-Sr-Ca-Cu-O single crystals over a wide range of magnetic fields (200 Oe to 40 kOe), and relative orientations θ between the magnetic field and the crystalline c^ axis. In addition to the large softening and dissipation peak previously observed and interpreted as due to flux-lattice melting, another distinctly different peak at higher temperatures is seen. The temperatures where the dissipation peaks take place are solely defined by the parallel component of the field cosθ, while the restoring force on the oscillator is due to both field components. We suggest that the two peaks are due to the softening of interplanar coupling at the low-temperature peak, and melting or depinning of the two-dimensional pancake vortices at the higher-temperature peak. |
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American Physical Society |
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Rapid Communication |
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BT @ pedrazp @ 10.1103/PhysRevB.44.7737 |
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543 |
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Correa, V.F.; Herbsommer, J.A.; Kaul, E.E.; de la Cruz, F.; Nieva, G. |
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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 |
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PHYSICAL REVIEW B |
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63 |
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9 |
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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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BT @ hernan @ |
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218 |
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López, D.; Nieva, G.; de la Cruz, F.; Jensen, Henrik Jeldtoft; O’Kane, Dominic |
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Title |
Flux cutting in YBa2Cu3O7-δ single crystals: Experiment and phenomenological model |
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Journal Article |
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1994 |
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Physical Review B |
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Phys. Rev. B |
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50 |
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9684 |
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We measured the current-induced loss of vortex correlation in YBa2Cu3O7-δ crystals using the pseudo-dc-flux-transformer geometry. We find that the current density Jcut at which the top and bottom voltage drops differ is a linear function of temperature, is independent of pinning, and depends on the thickness of the sample. This thickness dependence strongly suggests that the electrical current flows at the surface of the sample. The observed behavior with temperature, magnetic field, and thickness is described by a phenomenological model. |
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BT @ gnieva @ |
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445 |
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Esquinazi, P.; de la Cruz, M.E.; Ridner, A.; de la Cruz, F. |
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Heat treatment effects in amorphous metals: Zr70Cu30 and La70Cu30 |
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Journal Article |
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1982 |
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Solid State Communications |
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Solid State Commun. |
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44 |
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6 |
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941-944 |
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We measured the electrical resistivity (4–300 K), superconducting critical temperature and thermal conductivity (0.5–7 K) of the amorphous metals Zr70Cu30 and La70Cu30. Heat treatments below crystallization temperature induced changes in these properties. In particular, in the first stage of the annealing of Zr70Cu30 there are systematic changes in the thermal conductivity and the critical temperature, while the electrical resistivity remains constant. We show that there is no simple correlation between the thermal conductivity processes in the low temperature and plateau regions. We also show that the thermal conductivity of as quenched La70Cu30 is typical of amorphous metals, contrary to information previously reported. |
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Centro Atómico Bariloche – Instituto Balseiro |
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0038-1098 |
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BT @ pedrazp @ |
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529 |
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Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F. |
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Magnetic behaviour of superconductor/ferromagnet metallic and perovskite based superlattices |
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2007 |
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physica status solidi (c) |
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Phys. Status Solidi (c) |
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4 |
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11 |
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4174-4180 |
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74.45.+c; 74.78.Fk; 75.70.Cn |
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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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620 |
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Fasano, Y.; Menghini, M.; de la Cruz, F.; Nieva, G. |
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Title |
Weak interaction and matching conditions for replicas of vortex lattices |
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2000 |
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PHYSICAL REVIEW B |
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62 |
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22 |
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15183-15189 |
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We present experiments demonstrating the conditions under which weak interaction between replicas of vortex structures break their translational and rotational symmetry. The Fe clumps introduced by Bitter decorations of vortex structures are used to induce an extremely weak interaction fur subsequent vortex structures in low and high temperature superconducting crystals. The matching between the Fe pattern acid the vortex configuration require the structure to be prepared under quite stringent conditions: The field creating the structure has to be the same in magnitude although it can differ in orientation from that used for the preparation of the Fe pattern. The interaction between vortex replicas as represented by the Fe clumps of Bitter decorations makes it possible to differentiate the vortex nucleation and propagation mechanisms in low and high temperature superconductors. |
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0163-1829 |
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ISI:000165883800075 |
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BT @ hernan @ |
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219 |
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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. |
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Experimental evidence of a non-local resistivity in a vortex line liquid |
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1994 |
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Physica C: Superconductivity |
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Physica C |
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235-240 |
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4 |
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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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BT @ gnieva @ |
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450 |
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Civale, L.; de la Cruz, F. |
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Anomalous behavior of superconducting samples with a fixed number of vortices |
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1987 |
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Physical Review B |
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Phys. Rev. B |
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36 |
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7 |
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3560-3564 |
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We report an anomalous reversible temperature dependence of the magnetization of amorphous type-II superconductors. The experimental results were obtained studying the vortex pinning in samples with very low vortex concentration. The anomaly is shown to be a consequence of the lack of flux quantization in finite samples. |
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American Physical Society |
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BT @ pedrazp @ 10.1103/PhysRevB.36.3560 |
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