FLUCTUATION-ENHANCED CONDUCTIVITY AND MAGNETOCONDUCTIVITY OF HIGH-QUALITY YBA2CU3O7-DELTA CRYSTALS

被引：70

作者：

WINZER, K

KUMM, G

机构：

[1] I. Physikalisches Institut der Universität, Göttingen, W-3400

来源：

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER | 1991年 / 82卷 / 03期

关键词：

D O I：

10.1007/BF01357171

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

We present measurements of the in-plane resistivity rho-ab of YBa2Cu3O7-delta single crystals with T(c) congruent-to 92 K and rho-ab(100 K) congruent-to 50-mu-OMEGA cm. The temperature dependence of the fluctuation conductivity and of the magnetoconductivity above T(c) is analyzed in terms of direct and indirect fluctuation contributions for layered superconductors. The combination of fluctuation conductivity and magnetoconductivity allows to determine both coherence lengths zeta-ab(0) and zeta-c(0) as well as the phase-relaxation time tau-phi of the pairs in an unequivocal manner. Evidence for clean limit type-II superconductivity in our crystals is given by large values of the mean free path l(ab) >> zeta-ab(0).

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页码：317 / 321

页数：5

相关论文

共 18 条

[1] ZEEMAN EFFECT ON MAGNETORESISTANCE IN HIGH-TEMPERATURE SUPERCONDUCTORS [J].

ARONOV, AG ;

HIKAMI, S ;

LARKIN, AI .

PHYSICAL REVIEW LETTERS, 1989, 62 (08) :965-968

[2] INFLUENCE OF FLUCTUATION PAIRING OF ELECTRONS ON CONDUCTIVITY OF NORMAL METAL [J].

ASLAMAZO.LG ;

LARKIN, AI .

PHYSICS LETTERS A, 1968, A 26 (06) :238-&

[3] FLUX SEPARATION IN CRYSTAL-GROWTH OF YBA2CU3O7-X [J].

BOUTELLIER, R ;

SUN, BN ;

SCHEEL, HJ ;

SCHMID, H .

JOURNAL OF CRYSTAL GROWTH, 1989, 96 (02) :465-467

[4] THERMODYNAMIC FLUCTUATIONS IN THE SUPERCONDUCTOR Y1BA2CU3O9-DELTA - EVIDENCE FOR 3-DIMENSIONAL SUPERCONDUCTIVITY [J].

FREITAS, PP ;

TSUEI, CC ;

PLASKETT, TS .

PHYSICAL REVIEW B, 1987, 36 (01) :833-835

[5] DETERMINATION OF THE SUPERCONDUCTING GAP IN RBA2CU3O7-DELTA [J].

FRIEDL, B ;

THOMSEN, C ;

CARDONA, M .

PHYSICAL REVIEW LETTERS, 1990, 65 (07) :915-918

[6] SPECIFIC-HEAT OF A SINGLE-CRYSTAL OF YBA2CU3O7-DELTA - FLUCTUATION EFFECTS IN A BULK SUPERCONDUCTOR IN ZERO MAGNETIC-FIELD AND IN A MAGNETIC-FIELD [J].

GINSBERG, DM ;

INDERHEES, SE ;

SALAMON, MB ;

GOLDENFELD, N ;

RICE, JP ;

PAZOL, BG .

PHYSICA C, 1988, 153 :1082-1085

[7] REPRODUCIBLE TUNNELING DATA ON CHEMICALLY ETCHED SINGLE-CRYSTALS OF YBA2CU3O7 [J].

GURVITCH, M ;

VALLES, JM ;

CUCOLO, AM ;

DYNES, RC ;

GARNO, JP ;

SCHNEEMEYER, LF ;

WASZCZAK, JV .

PHYSICAL REVIEW LETTERS, 1989, 63 (09) :1008-1011

[8]

Halbritter J., 1989, International Journal of Modern Physics B, V3, P719, DOI 10.1142/S0217979289000531

[9]

Hikami S., 1988, Modern Physics Letters B, V2, P693, DOI 10.1142/S0217984988000369

[10] FLUCTUATION-ENHANCED CONDUCTIVITY OF HIGH-QUALITY YBA2CU3O7-DELTA SINGLE-CRYSTALS [J].

KUMM, G ;

WINZER, K .

PHYSICA B, 1990, 165 :1361-1362