TWIN BOUNDARIES, IMPURITIES, AND ANISOTROPY IN YBA2CU3O7-DELTA SINGLE-CRYSTALS

被引：4

作者：

BOHANDY, J ^{[1
]}

KIM, BF ^{[1
]}

MOORJANI, K ^{[1
]}

ADRIAN, FJ ^{[1
]}

KAISER, DL ^{[1
]}

SWARTZENDRUBER, LJ ^{[1
]}

GAYLE, FW ^{[1
]}

BENNETT, LH ^{[1
]}

机构：

[1] NATL INST STANDARDS & TECHNOL,GAITHERSBURG,MD 20899

来源：

PHYSICA C | 1992年 / 203卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(92)90519-I

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The role of twin boundaries and impurities in the superconducting properties of twinned and detwinned single crystals of YBa2Cu3O7-delta is studied via magnetically modulated microwave absorption (MAMMA) and SQUID magnetometry. Twin boundaries do not affect the T(c) (91.5 K) or the width of the superconducting transition of high quality gold-doped samples. In contrast, a twinned crystal containing additional impurities exhibits a lower T(c) (88 K), a larger transition width, and a secondary transition (T(c)=86 K) due most likely to the segregation of impurities at the twin boundaries. A 10-15% anisotropy in the value of dT(c)/dH is observed in the a-b plane of the detwinned crystal.

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收藏

页码：139 / 143

页数：5

相关论文

共 24 条

[1]

ABRIKOSOV AA, 1988, FUNDAMENTALS THEORY, P377

[2] IDENTIFICATION OF MULTIPHASIC AND WEAK-LINK STRUCTURES IN A (LA0.94SR0.06)2CUO4 SINGLE-CRYSTAL BY MAGNETICALLY MODULATED RESISTANCE [J].

ADRIAN, FJ ;

KIM, BF ;

MOORJANI, K ;

BOHANDY, J .

PHYSICAL REVIEW B, 1991, 43 (13) :10328-10334

[3] PARTICLE-SIZE AND TEMPERATURE-DEPENDENCE OF MICROWAVE NOISE IN SUPERCONDUCTING YBA2CU3O7-Y - EVIDENCE FOR RANDOM JOSEPHSON-JUNCTIONS [J].

BOHANDY, J ;

KIM, BF ;

ADRIAN, FJ ;

MOORJANI, K .

PHYSICAL REVIEW B, 1989, 39 (04) :2733-2735

[4] MAGNETICALLY MODULATED MICROWAVE-ABSORPTION IN THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)2CU(NCS)2 [WHERE BEDT-TTF IS BIS(ETHYLENEDITHIO)TETRATHIAFULVALENE] [J].

BOHANDY, J ;

KIM, BF ;

ADRIAN, FJ ;

MOORJANI, K ;

DARCANGELIS, S ;

COWAN, DO .

PHYSICAL REVIEW B, 1991, 43 (04) :3724-3727

[5] UNEXPECTED EFFECTS OF GOLD ON THE STRUCTURE, SUPERCONDUCTIVITY, AND NORMAL STATE OF YBA2CU3O7 [J].

CIEPLAK, MZ ;

XIAO, G ;

CHIEN, CL ;

STALICK, JK ;

RHYNE, JJ .

APPLIED PHYSICS LETTERS, 1990, 57 (09) :934-936

[6] ANISOTROPIC VORTEX STRUCTURE IN Y1BA2CU3O7 [J].

DOLAN, GJ ;

HOLTZBERG, F ;

FEILD, C ;

DINGER, TR .

PHYSICAL REVIEW LETTERS, 1989, 62 (18) :2184-2187

[7] WEAK-LINK STRUCTURE IN YBA2CU3O7 SINGLE-CRYSTALS - A MICROWAVE STUDY [J].

DULCIC, A ;

CREPEAU, RH ;

FREED, JH ;

SCHNEEMEYER, LF ;

WASZCZAK, JV .

PHYSICAL REVIEW B, 1990, 42 (04) :2155-2160

[8] DIRECT MEASUREMENT OF THE ANISOTROPY OF THE RESISTIVITY IN THE A-B PLANE OF TWIN-FREE, SINGLE-CRYSTAL, SUPERCONDUCTING YBA2CU3O7-DELTA [J].

FRIEDMANN, TA ;

RABIN, MW ;

GIAPINTZAKIS, J ;

RICE, JP ;

GINSBERG, DM .

PHYSICAL REVIEW B, 1990, 42 (10) :6217-6221

[9] ANISOTROPIC CRITICAL CURRENTS IN BA2YCU3O7 ANALYZED USING AN EXTENDED BEAN MODEL [J].

GYORGY, EM ;

VANDOVER, RB ;

JACKSON, KA ;

SCHNEEMEYER, LF ;

WASZCZAK, JV .

APPLIED PHYSICS LETTERS, 1989, 55 (03) :283-285

[10] ANISOTROPIC UPPER CRITICAL MAGNETIC-FIELD IN SINGLE-CRYSTAL BA2YCU3O7-Y [J].

HIDAKA, Y ;

ODA, M ;

SUZUKI, M ;

KATSUI, A ;

MURAKAMI, T ;

KOBAYASHI, N ;

MUTO, Y .

PHYSICA B & C, 1987, 148 (1-3) :329-331