WASHBOARD FREQUENCY OF THE MOVING VORTEX LATTICE IN YBA2CU3O6.93 DETECTED BY AC-DC INTERFERENCE

被引:56
作者
HARRIS, JM [1 ]
ONG, NP [1 ]
GAGNON, R [1 ]
TAILLEFER, L [1 ]
机构
[1] MCGILL UNIV, DEPT PHYS, MONTREAL, PQ H3A 2T8, CANADA
关键词
D O I
10.1103/PhysRevLett.74.3684
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
The depinned vortex lattice in a type II superconductor represents a periodic structure moving in a random distribution of pinning centers. Such a system displays a washboard frequency given by /2=v/a where v is the velocity and a the lattice period. By mixing a dc and an ac current (of frequency ext), we demonstrate the existence of the washboard effect in the vortex state in an untwinned crystal of YBa2Cu3O6.93. Jumps in the dc current-voltage characteristics are observed when and ext are harmonically related. We show that these jumps vanish when the line at the solid-to-liquid transition is crossed. © 1995 The American Physical Society.
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页码:3684 / 3687
页数:4
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