INVESTIGATION OF INTERGRAIN AND INTRAGRAIN CRITICAL CURRENTS IN HIGH-TC CERAMIC SUPERCONDUCTORS

被引：144

作者：

KUPFER, H ^{[1
]}

APFELSTEDT, I ^{[1
]}

FLUKIGER, R ^{[1
]}

KELLER, C ^{[1
]}

MEIERHIRMER, R ^{[1
]}

RUNTSCH, B ^{[1
]}

TUROWSKI, A ^{[1
]}

WIECH, U ^{[1
]}

WOLF, T ^{[1
]}

机构：

[1] UNIV KARLSRUHE,D-7500 KARLSRUHE 1,FED REP GER

来源：

CRYOGENICS | 1988年 / 28卷 / 10期

关键词：

Ceramic Superconductors - High Temperature Superconductors - Intergrain Critical Currents - Intragrain Critical Currents - Oxide Superconductors;

D O I：

10.1016/0011-2275(88)90148-8

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Polycrystalline sintered bulk samples of REBa2Cu3O7 with RE = Y, Gd were studied by a.c. susceptibility and an inductive measurement technique which allows the separation of intergrain (transport) from intragrain critical current density. Field and temperature dependence of the intergrain current are compared with theoretical predictions for a weakly coupled grain structure. Up to fields 0.3 T the weak link character of the intergrain current predominates. At higher fields it changes and points to a percolation current via superconducting grain boundaries. A quantitative correlation between intragrain current and twin spacing is hidden, probably by oxygen deficiency in the grain interior. No variation of the intragrain critical current density with temperature is observed up to 85 K in a textured specimen.

引用

页码：650 / 660

页数：11

共 47 条

[1] TUNNELING BETWEEN SUPERCONDUCTORS
AMBEGAOKAR, V
BARATOFF, A
[J]. PHYSICAL REVIEW LETTERS, 1963, 10 (11) : 486 - &
[2] RESPONSE OF PINNED FLUX VORTICES TO LOW-FREQUENCY FIELDS
CAMPBELL, AM
[J]. JOURNAL OF PHYSICS PART C SOLID STATE PHYSICS, 1969, 2 (08): : 1492 - &
[3] CAMPBELL AM, 1987, P LT18 KYOTO
[4] CRITICAL-CURRENT MEASUREMENTS IN EPITAXIAL-FILMS OF YBA2CU3O7-X COMPOUND
CHAUDHARI, P
KOCH, RH
LAIBOWITZ, RB
MCGUIRE, TR
GAMBINO, RJ
[J]. PHYSICAL REVIEW LETTERS, 1987, 58 (25) : 2684 - 2686
[5] CLEM JR, 1988, INT C MATERIALS MECH
[6] CLEM JR, 1987, P LT 18 KYOTO, P1161
[7] CRABTREE GW, 1988, QUANTUM FIELD THEORY
[8] ORIGIN OF SUPERCONDUCTIVE GLASSY STATE AND EXTRINSIC CRITICAL CURRENTS IN HIGH-TC OXIDES
DEUTSCHER, G
MULLER, KA
[J]. PHYSICAL REVIEW LETTERS, 1987, 59 (15) : 1745 - 1747
[9] DIRECT OBSERVATION OF ELECTRONIC ANISOTROPY IN SINGLE-CRYSTAL Y1BA2CU3O7-X
DINGER, TR
WORTHINGTON, TK
GALLAGHER, WJ
SANDSTROM, RL
[J]. PHYSICAL REVIEW LETTERS, 1987, 58 (25) : 2687 - 2690
[10] EKIN JW, 1987, ADV CERAM MATER, V2, P586

← 1 2 3 4 5 →