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Continuous Two-Dimensional Melting of Vortex-Solid in High Temperature Superconductors

Published online by Cambridge University Press:  28 February 2011

N.-C. Yeh
N.-C. Yeh*
Affiliation:
Department of Physics, California Institute of Technology Pasadena, CA 91125
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Abstract

A model of continuous two-dimensional melting in the mixed state of high temperature superconductors is proposed. Two-dimensional melting sets in at a cross-over temperature Tx (H) below the three-dimensinal phase transition Tx (H) due to finite size effects, and Tx (H) is a function of the sample thickness (lc ), applied magnetic field (H), and k(= λ/ξ) For a given zero-field transition temperature Tc0 and material properties, (such as defect density), the onset temperature of 2D-melting (Tx (H)) decreases with decreasing sample thickness and increasing magnetic field. In transport studies, thermally induced melting is further complicated by the depinning effect of high current densities.

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