ANISOTROPIC DYNAMICAL SCALING NEAR THE VORTEX-GLASS TRANSITION OF TWINNED YBA2CU3O7-DELTA

被引：69

作者：

KOTZLER, J ^{[1
]}

KAUFMANN, M ^{[1
]}

NAKIELSKI, G ^{[1
]}

BEHR, R ^{[1
]}

ASSMUS, W ^{[1
]}

机构：

[1] UNIV FRANKFURT,INST PHYS,D-60325 FRANKFURT,GERMANY

来源：

PHYSICAL REVIEW LETTERS | 1994年 / 72卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.72.2081

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The complex electrical conductivity sigma(omega) is determined from the linear ac susceptibility between 3 Hz and 3 MHz measured in fields between 0.4 and 12T parallel and perpendicular to the c axis of a twinned crystal. Dynamical scaling of Absolute value of sigma and sigma''/sigma' reveals ordering temperatures T(g)(B) and field-independent scaling functions by using the variable (T(c2) - T(g))/\T - T(g)\. For B perpendicular-to c, the critical exponents nu and z agree with values obtained on films indicating isotropic vortex-glass fluctuations, whereas those for B parallel-to c indicate elongated fluctuations in the c direction mediated by correlated pinning via the edges of twin boundaries.

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页码：2081 / 2084

页数：4

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