SQUID PICOVOLTOMETRY OF SINGLE-CRYSTAL BI2SR2CACU2O8+DELTA - OBSERVATION OF THE CROSSOVER FROM HIGH-TEMPERATURE ARRHENIUS TO LOW-TEMPERATURE VORTEX-GLASS BEHAVIOR

被引：167

作者：

SAFAR, H

GAMMEL, PL

BISHOP, DJ

MITZI, DB

KAPITULNIK, A

机构：

[1] AT&T BELL LABS,MURRAY HILL,NJ 07974

[2] STANFORD UNIV,STANFORD,CA 94305

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 17期

关键词：

D O I：

10.1103/PhysRevLett.68.2672

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Using a SQUID voltmeter we have measured current-voltage curves in untwinned crystals of Bi2Sr2CaCu2O8 + delta as a function of temperature and magnetic field. Our data show a clear crossover from high-temperature Arrhenius behavior to a critical region associated with the low-temperature three-dimensional vortex-glass phase transition. The critical exponents v(z - 1) = 7 +/- 1 in this system are in accord with theoretical models and previous measurements in YBa2Cu3O7. The width of the critical region collapses below 2 T, reflecting the changing role of dimensionality with field.

引用

页码：2672 / 2675

页数：4

共 28 条

[1]

BISHOP DJ, 1988, B AM PHYS SOC, V33, P606

[2] GIANT OUT-OF-PLANE MAGNETORESISTANCE IN BI-SR-CA-CU-O - A NEW DISSIPATION MECHANISM IN COPPER-OXIDE SUPERCONDUCTORS [J].