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Grigera, S.A.; Morre, E.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
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Two-step liquid-solid vortex transition with the field along the ab planes in YBa2Cu3O7-delta crystals |
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1999 |
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PHYSICAL REVIEW B |
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59 |
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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.; Morré, E.; Osquiguil, E.; Nieva, G.; De la Cruz, F. |
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Title |
Nonlocal transport properties and size effects in heavily twinned YBa2Cu3O7-delta single crystals |
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Journal Article |
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1998 |
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Solid State Communications |
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Solid State Commun. |
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107 |
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7 |
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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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0038-1098 |
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ISI:000074907100004 |
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BT @ hernan @ |
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237 |
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López, D.; Jagla, E. A.; Righi, E. F.; Osquiguil, E.; Nieva, G.; Morré, E.; de la Cruz, F.; Balseiro, C. A. |
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Title |
Dynamic softening of vortex lines in YBa2Cu3O7−δ single crystals |
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1996 |
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Physica C: Superconductivity |
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Physica C |
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260 |
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3-4 |
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211-216 |
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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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Morré, E.; Grigera, S.; Osquiguil, E.; Nieva, G.; de la Cruz, F. |
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Angular restrictions on the glass transition and on the c-axis correlated liquid phase in twinned YBa2Cu3O7-? |
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1997 |
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Physics Letters A |
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Phys. Lett. A |
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233 |
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1-2 |
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130-134 |
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We have measured the angular dependence of the vortex velocity correlation temperature Tth(H) in twinned YBa2Cu3O7-? single crystals. The data show that the c-axis correlated vortex liquid phase exists up to angles much larger than expected within a single vortex pinning picture. Despite this, the second-order solid-liquid glass transition is shown to be restricted only to external magnetic fields applied within a few degrees from the c-axis direction. |
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Centro Atómico Bariloche |
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03759601 |
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Cited By (since 1996): 13; Export Date: 17 April 2009; Source: Scopus; CODEN: PYLAA; Language of Original Document: English; Correspondence Address: Morr |
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BT @ osquigui @ |
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381 |
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