| 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 |
|
| Volume |
44 |
Issue |
|
Pages |
193-195 |
| Keywords |
|
| 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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0035-001X |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000077675900051 |
Approved |
no |
Call Number  |
BT @ hernan @ |
Serial |
182 |
| Permanent link to this record |
| |
|
| |
| 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 |
|
| Volume |
69 |
Issue |
1 |
Pages |
251-254 |
| Keywords |
|
| 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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0034-6748 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000071578800041 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
185 |
| Permanent link to this record |
| |
|
| |
| Author |
Guimpel, J.; de la Cruz, M.E.; de la Cruz, F.; Fink, H.J.; Laborde, O.; Villegier, J.C. |
| Title |
Size dependence of the Superconducting critical temperature and fields of Nb/Al multilayers |
Type |
Journal Article |
| Year |
1986 |
Publication |
Journal of Low Temperature Physics |
Abbreviated Journal |
J. Low Temp. Phys. |
| Volume |
63 |
Issue |
1-2 |
Pages |
151-165 |
| Keywords |
|
| Abstract |
The critical temperatureT cof Nb/Al multilayers decreases as the total sample thicknessd Tis decreased while the thickness of each Nb and Al layer is kept constant. To understand this behavior, models based on the proximity effect and on weak two-dimensional (2D) localization are employed. The latter uses a characteristic length, the thermal diffusion length, in relation tod Tto obtain 2D behavior and leads to a reasonable explanation ofT c(d T). It is also found that the slope atT c(d T) of the critical magnetic field perpendicular to the layers is independent ofd Twhen the Nb and Al layer thicknesses are kept constant. The angular dependence of the critical field is also measured. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0022-2291 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:A1986C112200008 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
193 |
| Permanent link to this record |
| |
|
| |
| Author |
Bridoux, G.; Nieva, G.; de la Cruz, F. |
| Title |
Phase-coherence effects in vortex transport entropy |
Type |
Journal Article |
| Year |
2008 |
Publication |
PHYSICAL REVIEW LETTERS |
Abbreviated Journal |
|
| Volume |
101 |
Issue |
11 |
Pages |
117002 |
| Keywords |
|
| Abstract |
Nernst and electrical resistivity measurements in superconducting YBa2Cu3O7-delta and Bi2Sr2CaCu2O8+delta with and without columnar defects show a distinctive thermodynamics of the respective liquid vortex matter. At a field-dependent high temperature region in the H-T phase diagram, the Nernst signal is independent of structural defects in both materials. At lower temperatures, in YBa2Cu3O7-delta, defects contribute only to the vortex mobility, and the transport entropy is that of a system of vortex lines. The transition to lower temperatures in Bi2Sr2CaCu2O8+delta has a different origin; the maximum in the Nernst signal when decreasing temperature is not associated with transport properties but with the entropy behavior of pancake vortices in the presence of structural defects. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0031-9007 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000259188700052 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
195 |
| Permanent link to this record |
| |
|
| |
| Author |
Bridoux, G.; Pedrazzini, P.; de la Cruz, F.; Nieva, G. |
| Title |
Angular field dependence of the Nernst effect in Bi2Sr2CaCu2O8+delta |
Type |
Journal Article |
| Year |
2007 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
|
| Volume |
460 |
Issue |
|
Pages |
841-842 |
| Keywords |
|
| Abstract |
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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0921-4534 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000249870600060 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
198 |
| Permanent link to this record |
| |
|
| |
| 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 |
|
| Volume |
371 |
Issue |
3 |
Pages |
237-242 |
| Keywords |
|
| 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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0921-4534 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000176131500007 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
212 |
| Permanent link to this record |
| |
|
| |
| 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 |
|
| Volume |
87 |
Issue |
5 |
Pages |
057003 |
| Keywords |
|
| 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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0031-9007 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000170212200049 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
215 |
| Permanent link to this record |
| |
|
| |
| 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 |
|
| Volume |
63 |
Issue |
9 |
Pages |
092502 |
| Keywords |
|
| Abstract |
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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0163-1829 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000167312000016 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
218 |
| Permanent link to this record |
| |
|
| |
| Author |
Fasano, Y.; Menghini, M.; de la Cruz, F.; Nieva, G. |
| Title |
Weak interaction and matching conditions for replicas of vortex lattices |
Type |
Journal Article |
| Year |
2000 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
|
| Volume |
62 |
Issue |
22 |
Pages |
15183-15189 |
| Keywords |
|
| Abstract |
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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0163-1829 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000165883800075 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
219 |
| Permanent link to this record |
| |
|
| |
| 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 |
Type |
Journal Article |
| Year |
2000 |
Publication |
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS |
Abbreviated Journal |
|
| Volume |
341 |
Issue |
|
Pages |
1285-1286 |
| Keywords |
|
| Abstract |
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. |
| Address |
|
| Corporate Author |
|
Thesis |
|
| Publisher |
|
Place of Publication |
|
Editor |
|
| Language |
|
Summary Language |
|
Original Title |
|
| Series Editor |
|
Series Title |
|
Abbreviated Series Title |
|
| Series Volume |
|
Series Issue |
|
Edition |
|
| ISSN |
0921-4534 |
ISBN |
|
Medium |
|
| Area |
|
Expedition |
|
Conference |
|
| Notes |
ISI:000165855700242 |
Approved |
no |
| Call Number |
BT @ hernan @ |
Serial |
221 |
| Permanent link to this record |
