PEAK EFFECT AS A PRECURSOR TO VORTEX LATTICE MELTING IN SINGLE-CRYSTAL YBA2CU3O7-DELTA

被引：198
作者：
KWOK, WK
FENDRICH, JA
VANDERBEEK, CJ
CRABTREE, GW
机构：
[1] ARGONNE NATL LAB, SCI & TECHNOL CTR SUPERCONDUCTIV, ARGONNE, IL 60439 USA
[2] IOWA STATE UNIV SCI & TECHNOL, DEPT PHYS & ASTRON, AMES, IA 50011 USA
来源：
PHYSICAL REVIEW LETTERS | 1994年 / 73卷 / 19期
关键词：
D O I：
10.1103/PhysRevLett.73.2614
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We present direct evidence of a ''peak effect'' as a precursor to vortex lattice melting in a single crystal of YBa2CU3O7-delta containing only two twin planes. The peak effect occurs just below the vortex liquid to solid phase transition in a narrow field region between 0.3 and 1.5 T for H parallel to c and is clearly observed as a function of both magnetic field and temperature. We demonstrate that the peak effect is due to enhanced vortex pinning by the twin boundaries, indicative of lattice softening prior to melting. In addition, we show evidence for a non-Ohmic behavior in the vortex liquid state due to depinning of the vortices from the two twin boundaries with increasing Lorentz force.
引用
收藏
页码：2614 / 2617
页数：4
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