Discontinuity of reversible magnetization in untwinned YBCO single crystals at the first order vortex melting transition

被引：200

作者：

Liang, RX

Bonn, DA

Hardy, WN

机构：

[1] Department of Physics, The University of British Columbia, Vancouver, BC, V6T 1Z1

来源：

PHYSICAL REVIEW LETTERS | 1996年 / 76卷 / 05期

关键词：

D O I：

10.1103/PhysRevLett.76.835

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report magnetization measurements on clean and untwinned YBa2Cu3O6.95 Single crystals with extremely low pinning. For the first time, an irreversibility line well below the vortex melting line has been achieved. A discontinuity in the magnetization at the vortex melting transition is observed, indicating a first order transition. The entropy change at the phase transition is 0.8k(B) per vortex per CuO2 double layer at 10 kOe and 0.6k(B) per vortex per CuO2 double layer at 40 kOe, in reasonable agreement with theoretical calculations.

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页码：835 / 838

页数：4

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