LOW-TEMPERATURE QUANTUM RELAXATION OF SINGLE 2-DIMENSIONAL VORTICES IN AN EPITAXIAL TL2BA2CA2CU3OX THIN-FILM

被引：11

作者：

GARCIA, A ^{[1
]}

ZHANG, XX ^{[1
]}

TEJADA, J ^{[1
]}

MANZEL, M ^{[1
]}

BRUCHLOS, H ^{[1
]}

机构：

[1] INST PHYS HOCHTECHNOL,D-07743 JENA,GERMANY

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 13期

关键词：

D O I：

10.1103/PhysRevB.50.9439

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Time-logarithmic magnetic-relaxation measurements have been obtained in an epitaxial Tl2Ba2Ca2Cu3Ox thin film for the zero-field cooled and remanent magnetization, with low and moderate applied magnetic fields. With low fields (H(a) = 50 Oe), the normalized magnetic relaxation rates, S = \d(M/M(i))/d lnt\, are temperature independent below T congruent-to 3.4 K, and the transition from the thermal to the quantum regime appears to be quite sharp. With moderate fields (H(a) = 500 Oe), the transition becomes smooth and takes place at temperatures higher than with low fields, T congruent-to 7 K. This seems to indicate that the mechanism responsible for low-temperature relaxation would be nondissipative Hall tunneling of two-dimensional vortices, rather than dissipative vortex motion.

引用

页码：9439 / 9444

页数：6

共 30 条

[1] THEORY OF FLUX CREEP IN HARD SUPERCONDUCTORS [J].