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Author  |
Kaufman, H.L.; de la Cruz, F. | ||||
| Title | Fluctuation induced diamagnetism in aluminum | Type | Journal Article | ||
| Year | 1971 | Publication | Solid State Communications | Abbreviated Journal | Solid State Commun. |
| Volume | 9 | Issue | 20 | Pages | 1729-1732 |
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| Abstract | The magnetic field and temperature dependence of the magnetization of bulk aluminum near the normal-superconductor transition has been measured. Due to the large amount of supercooling in one of the samples it was possible to extend the measurements well below the critical temperature. A comparison of the experimental results with theory is presented. Résumé Nous avons mesuré la dépendance en champ magnétique et en température de la magnétisation d'un échantillon massif d'aluminium au voisinage de la transition état normal-état supraconducteur. Grâce au ‘supercooling’ important d'un des échantillon, nous avons pu étendre nos mesures bien au dessous de la température critique. Nous comparons les résultats expérimentaux à la théorie. |
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| Series Volume | Series Issue | Edition | |||
| ISSN | 0038-1098 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 803 | ||
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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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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 451 | ||
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| Author |
López, D.; Nieva, G.; de la Cruz, F.; Jensen, Henrik Jeldtoft; O’Kane, Dominic | ||||
| Title | Flux cutting in YBa2Cu3O7-δ single crystals: Experiment and phenomenological model | Type | Journal Article | ||
| Year | 1994 | Publication | Physical Review B | Abbreviated Journal | Phys. Rev. B |
| Volume | 50 | Issue | Pages | 9684 | |
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| Abstract | We measured the current-induced loss of vortex correlation in YBa2Cu3O7-δ crystals using the pseudo-dc-flux-transformer geometry. We find that the current density Jcut at which the top and bottom voltage drops differ is a linear function of temperature, is independent of pinning, and depends on the thickness of the sample. This thickness dependence strongly suggests that the electrical current flows at the surface of the sample. The observed behavior with temperature, magnetic field, and thickness is described by a phenomenological model. | ||||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 445 | ||
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| Author |
López, D.; Decca, R.; de la Cruz, F. | ||||
| Title | Topological pinning and flux flow in ceramic superconductors | Type | Journal Article | ||
| Year | 1991 | Publication | Solid State Communications | Abbreviated Journal | |
| Volume | 79 | Issue | 11 | Pages | 959-962 |
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| Abstract | The transport current dissipation in the high Tc superconducting ceramic La1.85Sr0.15CuO4−δ shows a sin2 Θ voltage dependence where Θ is the angle between the transport current and the magnetic field. This result and the experimental evidence of an angle independent critical current cannot be explained by the conventional description of flux motion in homogeneous type II superconductors. The results are analyzed in the framework of a granular system where pinning is induced by the topological distribution of current flowing through a multiply connected medium. The dissipation in the superconducting state is found to be due to two additive contributions, one induced by the movement of magnetic flux and the other associated to dissipation in the Josephson junction. | ||||
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| ISSN | 0038-1098 | ISBN | Medium | ||
| Area | Expedition | Conference | |||
| Notes | Approved | no | |||
| Call Number | BT @ pedrazp @ | Serial | 808 | ||
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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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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 454 | ||
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| Author |
López, D.; Nieva, G.; de la Cruz, F. | ||||
| Title | In- and out-of-plane vortex correlations in YBa2Cu3O7 | Type | Journal Article | ||
| Year | 1994 | Publication | Physical Review B | Abbreviated Journal | Phys. Rev. B |
| Volume | 50 | Issue | Pages | 7219 | |
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 444 | ||
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| Author |
López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.; Kwok, W. K.; Fendrich, J. A.; Crabtree, G. W.; Paulius, L. | ||||
| Title | Discontinuous Onset of the c-axis Vortex Correlation at the Melting Transition in YBa2Cu3O7 | Type | Conference Article | ||
| Year | 1996 | Publication | Proceedings of the 10th Anniversary Hts Workshop on Physics, Materials and Applications | Abbreviated Journal | |
| Volume | Issue | Pages | 411 | ||
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| Publisher | World Scientific Publishing Company | Place of Publication | Singapore | Editor | Batlogg, B. |
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| ISSN | ISBN | 9810227159 | Medium | ||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 462 | ||
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| Author |
Lopez, D.; Righi, E. F.; Nieva, G.; de la Cruz, F.; Kwok, W. K.; Fendrich, J. A.; Crabtree, G. W.; Paulius, L. | ||||
| Title | Amplification of the c-axis vortex correlation by twin-boundary pinning at the vortex liquid-solid phase transition | Type | Journal Article | ||
| Year | 1996 | Publication | PHYSICAL REVIEW B | Abbreviated Journal | Phys. Rev. B |
| Volume | 53 | Issue | Pages | R8895 | |
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| Abstract | Transport measurements using the dc flux transformer configuration together with c-axis resistance data in clean and twinned YBa2Cu3O7-δ single crystals show that vortices are localized by the twin-boundary potential. The results support the existence of a divergent tilt modulus [D. R. Nelson and V. M. Vinokur, Phys. Rev. B 48, 13 060 (1993)] in a liquid that freezes into a Bose glass | ||||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 447 | ||
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| Author |
López, D.; Righi, E. F.; Nieva, G.; de la Cruz, F. | ||||
| Title | Coincidence of Vortex-Lattice Melting and Loss of Vortex Correlation along the c Direction in Untwinned YBa2Cu3O7-δ Single Crystals | Type | Journal Article | ||
| Year | 1996 | Publication | Physical Review Letters | Abbreviated Journal | Phys. Rev. Lett. |
| Volume | 76 | Issue | Pages | 4034 | |
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| Abstract | We report on transport measurements using the dc flux transformer configuration in clean and twinned single crystals of YBa2Cu3O7-δ. We show that correlated disorder changes not only the order of the solid-liquid phase transition but also the nature of the vortices in the liquid state. In clean crystals, melting is shown to take place between a solid of vortex lines and a liquid with no correlation in the direction of the magnetic field. | ||||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 448 | ||
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| Author |
López, D.; Rodríguez, E.; Nieva, G.; de la Cruz, F.; Cheong, S. W. | ||||
| Title | Three-dimensional vortex flux flow in LSCO and YBCO through pseudo dc flux transformer measurements | Type | Journal Article | ||
| Year | 1994 | Publication | Physica B: Condensed Matter | Abbreviated Journal | Physica B |
| Volume | 194-196 | Issue | 2 | Pages | 1977-1978 |
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| Abstract | A pseudo dc flux transformer configuration shows that the flux flow in La2−xSrxCuO4 (x=0.075) and YBa2Cu3O7 single crystals is due to the movement of 3-D vortices across the sample. We show that the loss of c-axis long range vortex correlation is achieved either by thermal fluctuations or by an inhomogeneus Lorentz force acting on the vortices. | ||||
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| Notes | Approved | no | |||
| Call Number | BT @ gnieva @ | Serial | 442 | ||
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