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Author (up) de la Cruz, F.; López, D.; Nieva, G. openurl 
  Title Thermally induced change in the vortex dimensionality of YBa2Cu3O7 single crystals Type Journal Article
  Year 1994 Publication Philosophical Magazine Part B Abbreviated Journal Philos. Mag. B  
  Volume 70 Issue 3 Pages 773 - 786  
  Abstract Transport measurements in YBa2Cu3O7 single 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.  
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  Call Number BT @ gnieva @ Serial 456  
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