VORTEX STATES OF YBa2Cu3O7-d: PHASE DIAGRAM; CALORIMETRIC AND MAGNETIC PROPERTIES

Authors report measurements of both the specific heat (C) and the magnetization (M) of a naturally untwinned YBa2Cu3O7-d (YBCO) single crystal in magnetic field (H) up to 26 T. The specific heat data determine the thermodynamic nature of the melting and show its evolution with increasing H within a...

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Bibliographic Details
Published in:Physica. C, Superconductivity Superconductivity, 2000-01, Vol.341-348, p.949-952
Main Authors: Marcenat, C, Bouquet, F, Calemczuk, R, Welp, U, Kwok, W K, Crabtree, G W
Format: Article
Language:English
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Summary:Authors report measurements of both the specific heat (C) and the magnetization (M) of a naturally untwinned YBa2Cu3O7-d (YBCO) single crystal in magnetic field (H) up to 26 T. The specific heat data determine the thermodynamic nature of the melting and show its evolution with increasing H within a low-H region (0.1 < H < 10.5 T) in which it is first order, with a discontinuity in C and a hysteretic latent heat, through a multicritical point, and into a high-H region (10.5 < H < 26 T) in which it is second order, with only a discontinuity in C. The qualitative change in melting in that latter region seems to reflect not a change in the nature of the solid but rather that of the (reversible) liquid. The M data show the relation of irreversibility to melting and allow to distinguish between the thermodynamic features at melting to disorder-dependent properties of the solid. 10 refs.
ISSN:0921-4534