ENHANCED FLUX PINNING BY COMBINED ATOMIC SUBSTITUTION AND PHASE-DECOMPOSITION IN CUPRATE SUPERCONDUCTORS

被引：13

作者：

TALLON, JL

POOKE, DM

BUCKLEY, RG

PRESLAND, MR

FLOWER, NE

GIBSON, S

GILBERD, PW

机构：

[1] DSIR Physical Sciences, Lower Hutt

来源：

APPLIED PHYSICS LETTERS | 1991年 / 59卷 / 10期

关键词：

D O I：

10.1063/1.105515

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The use of combined atomic substitution and phase decomposition is shown to achieve substantial enhancement of flux pinning in Y-Ba-Cu-O ceramics. The substituent is chosen to provide a high density of nucleation sites for decomposition and at the same time enhancing T(c) in the resulting composite superconductor. Bulk YbA2Cu4O8 (124) with 2.5% La substituted for Ba is decomposed by a short anneal beyond the stability boundary for YbA2Cu3O7 (123) at low oxygen pressure. The product, principally La-substituted 123 with stacking faults and precipitates of CuO in the grain boundaries, exhibits a 17-fold enhancement in intragrain J(c) at 77 K and 0.75 Tesla over unprocessed 123, rising to 50-fold at 85 K. Magnetization J(c) exceeds 10(4) A/cm2 at 0.75 Tesla for temperatures up to 87 K, the highest so far observed for a superconductor.

引用

页码：1239 / 1241

页数：3

共 15 条

[1] STABILITY LIMITS OF THE PEROVSKITE STRUCTURE IN THE Y-BA-CU-O SYSTEM [J].

BORMANN, R ;

NOLTING, J .

APPLIED PHYSICS LETTERS, 1989, 54 (21) :2148-2150

[2] CRITICAL OXYGEN PARTIAL-PRESSURE FOR THE INSITU PREPARATION OF HIGH-TC SUPERCONDUCTING THIN-FILMS [J].

BORMANN, R ;

NOLTING, J .

PHYSICA C, 1989, 162 :81-82

[3] CA-SUBSTITUTION AND LA-SUBSTITUTION IN YBA2CU3O7-DELTA, Y2BA4CU7O15-DELTA AND YBA2CU4O8 [J].

BUCKLEY, RG ;

POOKE, DM ;

TALLON, JL ;

PRESLAND, MR ;

FLOWER, NE ;

STAINES, MP ;

JOHNSON, HL ;

MEYLAN, M ;

WILLIAMS, GVM ;

BOWDEN, M .

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 1991, 174 (4-6) :383-393

[4] MECHANISMS OF CRYSTALLIZATION OF AMORPHOUS Y1BA2CU3O7-X THIN-FILMS DURING ANNEALING IN OXYGEN AND ARGON ATMOSPHERES - INSITU MEASUREMENTS [J].

GARRY, G ;

DUBREUIL, D ;

LEMAITRE, Y ;

DIEUMEGARD, D ;

SIEJKA, J ;

ORTEGA, C .

PHYSICA C, 1989, 162 :441-442

[5] ENHANCED FLUX PINNING BY PHASE-DECOMPOSITION IN Y-BA-CU-O [J].

JIN, S ;

TIEFEL, TH ;

NAKAHARA, S ;

GRAEBNER, JE ;

OBRYAN, HM ;

FASTNACHT, RA ;

KAMMLOTT, GW .

APPLIED PHYSICS LETTERS, 1990, 56 (13) :1287-1289

[6] LARGE MAGNETIC HYSTERESIS IN A MELT-TEXTURED Y-BA-CU-O SUPERCONDUCTOR [J].

JIN, S ;

SHERWOOD, RC ;

GYORGY, EM ;

TIEFEL, TH ;

VANDOVER, RB ;

NAKAHARA, S ;

SCHNEEMEYER, LF ;

FASTNACHT, RA ;

DAVIS, ME .

APPLIED PHYSICS LETTERS, 1989, 54 (06) :584-586

[7]

JIN S, 1991, PHYSICA C, V173, P73

[8] CRITICAL CURRENTS AFTER THERMAL-NEUTRON IRRADIATION OF URANIUM DOPED SUPERCONDUCTORS [J].

LUBORSKY, FE ;

ARENDT, RH ;

FLEISCHER, RL ;

HART, HR ;

LAY, KW ;

TKACZYK, JE ;

ORSINI, D .

JOURNAL OF MATERIALS RESEARCH, 1991, 6 (01) :28-35

[9]

MAWDSLEY A, IN PRESS PHYSICA C

[10] ZONE MELT TEXTURING OF YBA2CU3O6+X WITH SILVER ADDITIONS [J].

MCGINN, P ;

ZHU, N ;

CHEN, W ;

LANAGAN, M ;

BALACHANDRAN, U .

PHYSICA C, 1990, 167 (3-4) :343-347

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