QUANTUM AND CLASSICAL CREEP IN HIGH-TC AND ORGANIC SUPERCONDUCTORS

被引：8

作者：

MOTA, AC ^{[1
]}

JURI, G ^{[1
]}

POLLINI, A ^{[1
]}

AUPKE, K ^{[1
]}

TERUZZI, T ^{[1
]}

VISANI, P ^{[1
]}

HILTI, B ^{[1
]}

机构：

[1] CIBA GEIGY AG,CH-4002 BASEL,SWITZERLAND

来源：

PHYSICA SCRIPTA | 1992年 / T45卷

关键词：

D O I：

10.1088/0031-8949/1992/T45/014

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

At low temperatures, large, temperature-independent magnetic relaxation effects are found in the high-temperature superconducting ceramics and also in the organic superconductors giving evidence that, at these temperatures, vortex motion involves mainly a form of macroscopic quantum tunneling. At higher temperatures, flux motion is thermally assisted. The measured tunneling rates at T = 6 mK and low magnetic induction are in excellent agreement with the T --> 0 values given for single vortex tunneling by the quantum collective creep theory of Blatter, Geshkenbein and Vinokur. The effects of anisotropy and layering in the tunneling rates of single crystals are in very good agreement with the aforementioned theory.

引用

页码：69 / 73

页数：5

共 17 条

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

ANDERSON, PW .

PHYSICAL REVIEW LETTERS, 1962, 9 (07) :309-&

[2] QUANTUM COLLECTIVE CREEP [J].

BLATTER, G ;

GESHKENBEIN, VB ;

VINOKUR, VM .

PHYSICAL REVIEW LETTERS, 1991, 66 (25) :3297-3300

[3]

BLATTER G, IN PRESS

[4] FLUX CREEP AND CURRENT RELAXATION IN HIGH-TC SUPERCONDUCTORS [J].

FEIGELMAN, MV ;

GESHKENBEIN, VB ;

VINOKUR, VM .

PHYSICAL REVIEW B, 1991, 43 (07) :6263-6265

[5] LOW-TEMPERATURE MAGNETIC-RELAXATION IN YBA2CU3O7-DELTA - EVIDENCE FOR QUANTUM TUNNELING OF VORTICES [J].

FRUCHTER, L ;

MALOZEMOFF, AP ;

CAMPBELL, IA ;

SANCHEZ, J ;

KONCZYKOWSKI, M ;

GRIESSEN, R ;

HOLTZBERG, F .

PHYSICAL REVIEW B, 1991, 43 (10) :8709-8712

[6] QUANTUM FLUX CREEP IN LAYERED HIGH-TC SUPERCONDUCTORS [J].

IVLEV, BI ;

OVCHINNIKOV, YN ;

THOMPSON, RS .

PHYSICAL REVIEW B, 1991, 44 (13) :7023-7027

[7]

MITIN AV, 1987, ZH EKSP TEOR FIZ, V66, P335

[8] RELAXATION EFFECTS IN HIGH-TC SUPERCONDUCTORS [J].

MOTA, AC ;

POLLINI, A ;

VISANI, P ;

MULLER, KA ;

BEDNORZ, JG .

PHYSICA SCRIPTA, 1988, 37 (05) :823-824

[9] LOW-FIELD MAGNETIC-RELAXATION EFFECTS IN HIGH-TC SUPERCONDUCTORS SR-LA-CU-O AND BA-LA-CU-O [J].

MOTA, AC ;

POLLINI, A ;

VISANI, P ;

MULLER, KA ;

BEDNORZ, JG .

PHYSICAL REVIEW B, 1987, 36 (07) :4011-4013

[10] FLUX MOTION BY QUANTUM TUNNELING [J].

MOTA, AC ;

JURI, G ;

VISANI, P ;

POLLINI, A ;

TERUZZI, T ;

AUPKE, K ;

HILTI, B .

PHYSICA C, 1991, 185 :343-348

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