LOCK-IN OSCILLATIONS IN MAGNETIC HYSTERESIS CURVES OF YBA2CU3O7-X SINGLE-CRYSTALS

被引：69

作者：

OUSSENA, M ^{[1
]}

DEGROOT, PAJ ^{[1
]}

GAGNON, R ^{[1
]}

TAILLEFER, L ^{[1
]}

机构：

[1] MCGILL UNIV,DEPT PHYS,MONTREAL H3A 2T8,QUEBEC,CANADA

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 22期

关键词：

D O I：

10.1103/PhysRevLett.72.3606

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report the first direct experimental evidence of intrinsic pinning in ysteresis loops of untwinned YBa2Cu3O7-x single crystals, for magnetic fields perpendicular to the c axis. We have observed osciliations in the M-H loops that are well explained when one considers the layered structure of this compound. The oscillations are found to be periodic in H(a)-1/2 and are induced by a succession of transitions between states for which the vortex lattice is commensurate with the crystal lattice periodicity in the direction perpendicular to the CuO2 planes. The following anisotropy parameters were extracted from the experimental results: GAMMA(cb) = (m(c)/m(b))1/2 = 6.3, GAMMA(ca) = (m(c)/m(a)1/2 = 5.6, and GAMMA(ab) = (m(a)/m(b))1/2 = 1.13.

引用

页码：3606 / 3609

页数：4

共 18 条

[1] VORTEX LATTICE OF HIGHLY ANISOTROPIC LAYERED SUPERCONDUCTORS IN STRONG, PARALLEL MAGNETIC-FIELDS [J].