| 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 |
Abbreviated Journal |
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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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| ISSN |
0163-1829 |
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ISI:000084631900027 |
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Call Number  |
BT @ hernan @ |
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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 |
| 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 @ |
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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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| ISSN |
0038-1098 |
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ISI:000074907100004 |
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BT @ hernan @ |
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237 |
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| Author |
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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| ISSN |
0921-4534 |
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ISI:A1990CN49800014 |
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no |
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BT @ hernan @ |
Serial |
261 |
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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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no |
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BT @ hernan @ |
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275 |
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| Author |
Correa, V.F.; Nieva, G.; Pastoriza, H.; de la Cruz, F. |
| Title |
The true pinning force range in Bi2Sr2CaCu2O8 single crystals at low temperatures |
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Journal Article |
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2004 |
Publication |
Physica C |
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408-410 |
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531-532 |
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We study the effective profile of the pinning potential well in Bi$2$Sr$2$CaCu$_2$O8+δ single crystals using transverse ac magnetic susceptibility. The results show that the harmonic approximation for the potential well (linear regime) is valid up to vortex displacements $r\simeqξ$, where ξ, is the coherence length. In spite of this, it is necessary to induce displacements of the vortex structure much larger than ξ to depin it from its potential. This is shown to take place even in the single vortex limit. |
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BT @ hernan @ correa04 |
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9 |
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| Author |
Fasano, Y.; de Seta, M.; Menghini, M.; Pastoriza, H.; de la Cruz, F. |
| Title |
Imaging the structure of the interface between symmetries interconnected by a discontinuous transition |
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Journal Article |
| Year |
2003 |
Publication |
Solid State Communications |
Abbreviated Journal |
Solid State Commun. |
| Volume |
128 |
Issue |
3-4 |
Pages |
51-55 |
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We have been able to observe with single particle resolution the interface between two structural symmetries that cannot be interconnected by a continuous transition. By means of an engineered 2D potential that pins the extremity of vortex strings a square symmetry was imposed at the surface of a 3D vortex solid. Using the Bitter decoration technique and on account of the continuous vortex symmetry, we visualize how the induced structure transforms along the vortex direction before changing into the expected hexagonal structure at a finite distance from the surface. |
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BT @ hernan @ fasano03a |
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18 |
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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) |
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4 |
Issue |
11 |
Pages |
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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no |
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BT @ jguimpel @ |
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620 |
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Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodríguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V. |
| Title |
Logarithmic to nonlogarithmic flux creep transition and magnetic flux hardening in BiSrCaCuO superconducting ceramics |
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Journal Article |
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1989 |
Publication |
Physica C: Superconductivity |
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162-164, Part 1 |
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665-666 |
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A sharp temperature and field dependent transition from a logarithmic to a non-logarithmic flux creep behavior has been found in BiSrCaCuO superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed. |
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0921-4534 |
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no |
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BT @ jguimpel @ |
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626 |
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Safar, H.; Durán, C.; Guimpel, J.; Civale, L.; Luzuriaga, J.; Rodriguez, E.; de la Cruz, F.; Fainstein, C.; Schneemeyer, L.F.; Waszczak, J.V. |
| Title |
Logarithmic-to-nonlogarithmic flux-creep transition and magnetic-flux hardening in Bi-Sr-Ca-Cu-O superconducting ceramics |
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Journal Article |
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1989 |
Publication |
Physical Review B |
Abbreviated Journal |
Phys. Rev. B |
| Volume |
40 |
Issue |
10 |
Pages |
7380 |
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A sharp temperature- and field-dependent transition from a logarithmic to a nonlogarithmic flux-creep behavior has been found in Bi-Sr-Ca-Cu-O superconductors. The transition is not followed by any noticeable change in the magnetization. However, vibrating-reed measurements show that it coincides with a strong hardening of the magnetic structure. The transition occurs at fields and temperatures well below the reversibility line. The possible relation to the recently proposed flux lattice melting is discussed. |
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American Physical Society |
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BT @ jguimpel @ 10.1103/PhysRevB.40.7380 |
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627 |
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