UNIVERSALITY OF FREQUENCY AND FIELD SCALING OF THE CONDUCTIVITY MEASURED BY AC SUSCEPTIBILITY OF A YBA2CU3O7 FILM

被引：66

作者：

KOTZLER, J ^{[1
]}

NAKIELSKI, G ^{[1
]}

BAUMANN, M ^{[1
]}

BEHR, R ^{[1
]}

GOERKE, F ^{[1
]}

BRANDT, EH ^{[1
]}

机构：

[1] MAX PLANCK INST MET RES,D-70569 STUTTGART,GERMANY

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.50.3384

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Utilizing an exact inversion scheme, we determine the complex linear conductivity sigma(omega) of a YBa2Cu3O7 film from the linear magnetic ac susceptibility which has been measured from 3 mHZ to 50 MHz in fields between 0.4 and 4 T applied parallel to the c axis of a 250-nm thin disk. The frequency derivative of the phase sigma''/sigma' and the dynamical scaling of sigma(omega) above and below T(g)(B) provide clear evidence for a continuous phase transition at T(g) to a generic superconducting state. Based on the vortex-glass scaling model, the resulting critical exponents nu and z are close to those frequently obtained on films by other means and associated with an isotropic vortex glass. The field effect on sigma(omega) can be related to the increase of the glass coherence length, xi(g) approximately B.

引用

页码：3384 / 3391

页数：8

共 41 条

[1] VOLTAGE DUE TO THERMAL NOISE IN DC JOSEPHSON EFFECT [J].