ANOMALIES IN THE MAGNETIZATION OF MELT-PROCESSED YBCO SUPERCONDUCTORS

被引：9

作者：

HOJAJI, H ^{[1
]}

HU, S ^{[1
]}

BARKATT, A ^{[1
]}

DAVIS, DD ^{[1
]}

THORPE, AN ^{[1
]}

机构：

[1] HOWARD UNIV,WASHINGTON,DC 20059

来源：

PHYSICA C | 1992年 / 195卷 / 1-2期

基金：

美国国家航空航天局;

关键词：

D O I：

10.1016/0921-4534(92)90083-O

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Anomalies have been observed in the magnetization curves of melt-processed polycrystalline YBCO materials containing certain dopants such as Pr and Pt. Such anomalies are not produced, and are even suppressed, by other dopants, such as Nb. The anomaly consists of the appearance of a second, higher-field peak in the irreversible region of the magnetization plot. It can be attributed to uncoupling of flux-pinning centers from the superconducting matrix at high fields. Creep measurements show that the activation energy for flux creep exhibits a maximum at the vicinity of the anomalous second peak.

引用

页码：135 / 144

页数：10

共 17 条

[1] OXYGEN-DEFECT FLUX PINNING, ANOMALOUS MAGNETIZATION AND INTRAGRAIN GRANULARITY IN YBA2CU3O7-DELTA [J].

DAEUMLING, M ;

SEUNTJENS, JM ;

LARBALESTIER, DC .

NATURE, 1990, 346 (6282) :332-335

[2] FLUX CREEP AND CRITICAL CURRENTS IN EPITAXIAL HIGH-TC FILMS [J].

GRIESSEN, R ;

LENSINK, JG ;

SCHRODER, TAM ;

DAM, B .

CRYOGENICS, 1990, 30 (07) :563-568

[3] SUPERCONDUCTING CUPRATES PREPARED BY THE MELT QUENCH PROCESS AND CONTAINING EXCESS Y OR ADDITIVES [J].

HOJAJI, H ;

BARKATT, A ;

HU, SX ;

MICHAEL, KA ;

THORPE, AN ;

TALMY, IG ;

HAUGHT, DA ;

ALTERESCU, S .

MATERIALS RESEARCH BULLETIN, 1990, 25 (06) :765-777

[4]

HU S, 1992, IN PRESS

[5]

HU S, 1991, THESIS CATHOLIC U AM

[6] ON THE LOCALIZATION OF CHARGE-CARRIERS AND SUPPRESSION OF SUPERCONDUCTIVITY BY PRASEODYMIUM IN SYSTEMS DERIVED FROM YBA2CU3O7-D [J].

INFANTE, C ;

ELMOUSLY, MK ;

DAYAL, R ;

HUSAIN, M ;

SIDDIQI, SA ;

GANGULY, P .

PHYSICA C, 1990, 167 (5-6) :640-656

[7] A STUDY OF THE MICROSTRUCTURE OF EPITAXIAL HETEROSTRUCTURES OF YBA2CU3O7 AND PRBA2CU3O7 [J].

JIA, CL ;

KABIUS, B ;

SOLTNER, H ;

POPPE, U ;

URBAN, K ;

SCHUBERT, J ;

BUCHAL, C .

PHYSICA C, 1990, 167 (5-6) :463-471

[8] INTRAGRAIN JUNCTIONS IN YBA2CU3O7-X CERAMICS AND SINGLE-CRYSTALS [J].

KUPFER, H ;

APFELSTEDT, I ;

FLUKIGER, R ;

KELLER, C ;

MEIERHIRMER, R ;

RUNTSCH, B ;

TUROWSKI, A ;

WIECH, U ;

WOLF, T .

CRYOGENICS, 1989, 29 (3A) :268-280

[9]

LARBALESTIER DC, PREPRINT

[10]

MURAKAMI M, 1991, LOS ALAMOS S

← 1 2 →