INVESTIGADORES
NIEVA Gladys Leonor
artículos
Título:
Thermally induced change in the vortex dimensionality of yba2cu307 single crystals
Autor/es:
DE LA CRUZ, F.; LÓPEZ, D.; NIEVA, G.
Revista:
Philosophical Magazine B: Physics of Condensed Matter; Statistical Mechanics, Electronic, Optical and Magnetic Properties
Editorial:
Taylor & Francis
Referencias:
Año: 1994 vol. 70 p. 773 - 786
ISSN:
1364-2812
Resumen:
Transport measurements in YBa2Cu307single crystals using a modification of the d.c. flux transformer configuration are reported. We show that, for applied magnetic fields in the crystallographic c direction, the vortex correlation length in this direction is reduced to values smaller than the thickness of the sample. The reduction can be induced either by thermal disorder (linear response) or by flux cutting after the vortices reach a critical velocity (nonlinear response). The results show that, in the transition from a vortex-glass state to a vortex-liquid state, the vortices are effectively three dimensional in character. A two-dimensional regime is induced at higher temperatures well inside the reversibility region. © 1994 Taylor & Francis Group, LLC.
