| 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 @ |
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182 |
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| Author |
Valenzuela, S.O.; Ferrari, H.; Bekeris, V.; Marconi, M.C.; Guimpel, J.; de la Cruz, F. |
| Title |
Nonconventional short-time dc magnetometer for superconducting films |
Type |
Journal Article |
| Year |
1998 |
Publication |
REVIEW OF SCIENTIFIC INSTRUMENTS |
Abbreviated Journal |
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| Volume |
69 |
Issue |
1 |
Pages |
251-254 |
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| Abstract |
A nonconventional technique for the measurement of magnetic relaxation in superconducting films at short times (similar to 10(-5) s) is described. This technique combines the application of a pulsed magnetic field and a synchronized high-energy pulsed laser. Remanent magnetic relaxation in (Y;Gd)Ba2Cu3O7-delta thin films is reported over five decades time at reduced temperatures above 0.8. (C) 1998 American Institute of Physics. |
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0034-6748 |
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ISI:000071578800041 |
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BT @ hernan @ |
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185 |
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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 |
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237-242 |
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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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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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| Volume |
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 @ |
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219 |
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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 @ |
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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 |
| Year |
1999 |
Publication |
PHYSICAL REVIEW B |
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| Volume |
59 |
Issue |
17 |
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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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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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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 |
Correa, V.F.; Nieva, G.; Pastoriza, H.; de la Cruz, F. |
| Title |
The true pinning force range in Bi2Sr2CaCu2O8 single crystals at low temperatures |
Type |
Journal Article |
| Year |
2004 |
Publication |
Physica C |
Abbreviated Journal |
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| Volume |
408-410 |
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Pages |
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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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 |
Ridner, A.; de la Cruz, F.; Martinez, E.N. |
| Title |
Surface superconductivity and Kapitza resistance |
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Conference Article |
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1980 |
Publication |
Phonon Scattering in Condensed Matter |
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199-202 |
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It has been shown1 that surface superconductivity can be used as a localized thermomether to study the temperature close to an interface through which heat is being transported. Knowledge of the temperature profile in the interface region provides evidence which any theory of the heat transport mechanism must take into account. For interfaces between pure lead and HeII we have previously found1 clear differences between extrapolated surface temperatures Tk. and Tm, measured within some 1000Ã… of the interface using a superconducting thermometer. (The reader is refered to ref.1 for details on the experimental method). |
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Plenum Publishing Corp. |
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New York |
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Maris, H.J. |
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Phonon Scattering in Condensed Matter |
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III International conference on Phonon Scattering in Condensed Matter |
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BT @ pedrazp @ |
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555 |
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