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| Author |
López, D.; Nieva, G.; de la Cruz, F. |
| Title |
Long range correlations of the vortex structure in YBCO single crystals |
Type |
Journal Article |
| Year |
1994 |
Publication  |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
4 |
Pages |
2575-2576 |
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| Abstract |
Transport measurements in the mixed state of YBa2Cu3O7 single crystals using the “DC flux transformer” configuration show that the glass-liquid phase transition at the irreversibility line, TI(H), behaves as a three dimensional vortex phase transition. These results together with resistance measurements in the c direction show that the vortex correlation across the sample is destroyed at a temperature Tth(H), higher than TI(H). The sample thickness dependence of Tth(H) suggest that in the real thermodynamic phase transition (infinite sample), the long range correlation in the ab plane as well in the c direction is lost at the single temperature TI(H). |
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BT @ gnieva @ |
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451 |
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| Author |
de la Cruz, F.; Pastoriza, H.; López, D.; Goffman, M. F.; Arribére, A.; Nieva, G. |
| Title |
Consequences of 3D-2D vortex decoupling on the phase diagram of HTS |
Type |
Journal Article |
| Year |
1994 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
235-240 |
Issue |
1 |
Pages |
83-86 |
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| Abstract |
We discuss the quench of the long range order in the direction parallel and perpendicular to the field, in the mixed state of BSCCO(2212) and YBCO(123) single crystals. The experimental data show that the high temperature vortex phase in both systems is an uncorrelated liquid phase in all directions. |
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BT @ gnieva @ |
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453 |
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| Author |
López, D.; Jagla, E. A.; Righi, E. F.; Osquiguil, E.; Nieva, G.; Morré, E.; de la Cruz, F.; Balseiro, C. A. |
| Title |
Dynamic softening of vortex lines in YBa2Cu3O7−δ single crystals |
Type |
Journal Article |
| Year |
1996 |
Publication |
Physica C: Superconductivity |
Abbreviated Journal |
Physica C |
| Volume |
260 |
Issue |
3-4 |
Pages |
211-216 |
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| Abstract |
Transport measurements in the mixed state of oxygen-deficient YBa2Cu3O7−δ single crystals using the flux transformer configuration show that the flux liquid changes with increasing anisotropy from strongly correlated to uncorrelated in the field direction. For intermediate coupling, the current inducing loss of vortex correlation has a maximum near the irreversibility temperature. Thus, an effective softening of vortex lines with decreasing temperature is detected. We propose a simple model that accounts for this behavior by including the effects of the pinning potential on the dynamics of vortices. |
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BT @ gnieva @ |
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454 |
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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 |
| Year |
1989 |
Publication |
Physica C: Superconductivity |
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162-164, Part 1 |
Issue |
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Pages |
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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| Author |
Guimpel, J.; Monton, C.; Haberkorn, N.; de la Cruz, F. |
| Title |
Magnetic behaviour of superconductor/ferromagnet metallic and perovskite based superlattices |
Type |
Journal Article |
| Year |
2007 |
Publication |
physica status solidi (c) |
Abbreviated Journal |
Phys. Status Solidi (c) |
| Volume |
4 |
Issue |
11 |
Pages |
4174-4180 |
| Keywords |
74.45.+c; 74.78.Fk; 75.70.Cn |
| Abstract |
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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| Author |
de la Cruz, F.; de la Cruz, M.E.; Cotignola, J.M. |
| Title |
Longitudinal Magnetomorphic Effect in Indium Films |
Type |
Journal Article |
| Year |
1967 |
Publication |
Physical Review |
Abbreviated Journal |
Phys. Rev. |
| Volume |
163 |
Issue |
3 |
Pages |
575-578 |
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American Physical Society |
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no |
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BT @ pedrazp @ PhysRev.163.575 |
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537 |
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de la Cruz, F.; Maloney, M.D.; Cardona, M. |
| Title |
Variation of the Ratio Hc3/Hc2 in the Immediate Vicinity of ${T}_{c}$ |
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Journal Article |
| Year |
1969 |
Publication |
Physical Review |
Abbreviated Journal |
Pr |
| Volume |
187 |
Issue |
2 |
Pages |
766-767 |
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American Physical Society |
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no |
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BT @ pedrazp @ |
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805 |
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Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic state modification induced by superconducting response in ferromagnet/superconductor Nb/Co superlattices |
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Journal Article |
| Year |
2008 |
Publication |
PHYSICAL REVIEW B |
Abbreviated Journal |
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77 |
Issue |
10 |
Pages |
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Magnetization measurements in superconductor/ferromagnet Nb/Co superlattices show a complex behavior as a function of temperature, applied field, and sample history. Based on a simple model, it is shown that this behavior is due to an interplay between the superconductor magnetization temperature dependence, the ferromagnet magnetization time dependence, and the stray fields of both materials. It is also shown that the magnetic state of the Co layers is modified by the Nb superconducting response, implying that the problem of a superconductor/ferromagnetic heterogeneous sample has to be solved in a self-consistent manner. |
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1098-0121 |
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ISI:000254542700117 |
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no |
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BT @ hernan @ |
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146 |
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Monton, C.; de la Cruz, F.; Guimpel, J. |
| Title |
Magnetic behavior of superconductor/ferromagnet superlattices |
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Journal Article |
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2007 |
Publication |
PHYSICAL REVIEW B |
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75 |
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6 |
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A study of the electromagnetic response of superconductor/ferromagnet Nb/Co superlattices is presented. The dc magnetization is measured as a function of Co layer thickness, applied field H-a, and temperature. For very thin Co layers, no ferromagnetism is detected and the observed response is essentially that of a collection of uncoupled Nb layers. When the Co layer is thick enough for ferromagnetism to be established, prior to the field-cooled magnetization measurements, the Co layers are magnetically saturated in the parallel or antiparallel directions to H-a. In this case, the magnetic response of the otherwise uncoupled Nb layers is found to depend on both H-a and the stray fields. |
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1098-0121 |
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ISI:000244533000075 |
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no |
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BT @ hernan @ |
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151 |
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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 |
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Journal Article |
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2001 |
Publication |
PHYSICAL REVIEW B |
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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 @ |
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218 |
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