| Records |
| 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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| 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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BT @ hernan @ |
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212 |
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| Author |
Correa, V.F.; Nieva, G.; de la Cruz, F. |
| Title |
Vortex softening: Origin of the second peak effect in Bi2Sr2CaCu2O8+delta |
Type |
Journal Article |
| Year |
2001 |
Publication |
PHYSICAL REVIEW LETTERS |
Abbreviated Journal |
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| Volume |
87 |
Issue |
5 |
Pages |
057003 |
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| Abstract |
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 @ |
Serial |
215 |
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| Author |
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 |
Type |
Journal Article |
| Year |
2001 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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| Volume |
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 @ |
Serial |
218 |
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| Author |
Fasano, Y.; Menghini, M.; de la Cruz, F.; Nieva, G. |
| Title |
Weak interaction and matching conditions for replicas of vortex lattices |
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Journal Article |
| Year |
2000 |
Publication |
PHYSICAL REVIEW B |
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62 |
Issue |
22 |
Pages |
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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no |
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BT @ hernan @ |
Serial |
219 |
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| Author |
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 |
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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 |
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 |
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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.; Morre, E.; Osquiguil, E.; Balseiro, C.; Nieva, G.; de la Cruz, F. |
| Title |
Bose-glass phase in twinned YBa2Cu3O7-delta |
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Journal Article |
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1998 |
Publication |
PHYSICAL REVIEW LETTERS |
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81 |
Issue |
11 |
Pages |
2348-2351 |
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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.; 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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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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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 |
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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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de la Cruz, F.; Fink, H.J.; Luzuriaga, J. |
| Title |
Temperature dependence of the superconducting giant-vortex state. Theory and Experiment |
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Journal Article |
| Year |
1979 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
20 |
Issue |
5 |
Pages |
1947-1959 |
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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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no |
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BT @ hernan @ |
Serial |
275 |
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