Anisotropic latent heat of vortex-lattice melting in untwinned YBa2Cu3O7-delta

被引：154

作者：

Schilling, A

Fisher, RA

Phillips, NE

Welp, U

Kwok, WK

Crabtree, GW

机构：

[1] UNIV CALIF BERKELEY, DEPT CHEM, BERKELEY, CA 94720 USA

[2] ARGONNE NATL LAB, SCI & TECHNOL CTR SUPERCONDUCTIV, ARGONNE, IL 60439 USA

来源：

PHYSICAL REVIEW LETTERS | 1997年 / 78卷 / 25期

关键词：

D O I：

10.1103/PhysRevLett.78.4833

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report a distinct thermal signature of the first-order vortex-lattice melting for the external magnetic field H both parallel and perpendicular to the c axis of an untwinned YBa2Cu3O7-delta single crystal. Latent heats and discontinuities in specific heat were observed for each configuration. The entropies of melting and the melting lines H-m(T) both scale with an anisotropy parameter gamma approximate to 8. The specific heat of the vortex fluid is considerably larger than that of the vortex solid (by up to 2 mJ/mole K-2), which is not explained by simple arguments based on counting the numbers of thermodynamic degrees of freedom.

引用

页码：4833 / 4836

页数：4

共 50 条

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