Influence of hole-filling by La and hole-doping by Ca on the superconductivity of NdBa2Cu3O7-δ

被引：11

作者：

Joshi, AG ^{[1
]}

Kuberkar, DG ^{[1
]}

Kulkarni, RG ^{[1
]}

机构：

[1] Saurashtra Univ, Dept Phys, Rajkot 360005, Gujarat, India

来源：

PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1999年 / 320卷 / 1-2期

关键词：

La; Ca; NdBa2Cu3O7-delta;

D O I：

10.1016/S0921-4534(99)00316-0

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The structural and superconducting properties of La- and Ca-substituted (Nd1-xCax)(Ba2-yLay)Cu3Oz samples prepared under identical conditions have been investigated by X-ray diffraction (XRD), resistivity, ac susceptibility and oxygen content measurements. The effect of increasing La-concentration in Nd(Ba2-yLay)Cu3Oz is in lowering the carrier concentration and decreasing T-c, which is attributed to hole-filling by La. This suppression of T-c has been compensated by appropriate hole-doping with Ca in (Nd1-xCax)(Ba2-yLay)Cu3Oz, which shows that for a fixed La content at Ba-site, T-c increases dramatically as the Ca content increases. For instance, in the oxide (Nd1-xCax)(Ba1.6La0.4)Cu3Oz, the T-c increases from 0.0 K (x = 0.0, non-superconductor) to 84.0 K (x = 0.4, compensated oxide) as the hole-filling by La is completely balanced by hole-doping from Ca. (C) 1999 Elsevier Science B.V. All rights reserved.

引用

页码：87 / 95

页数：9

共 28 条

[1]

ABRIKOSOV AA, 1961, SOV PHYS JETP-USSR, V12, P1243

[2] THEORY OF SUPERCONDUCTIVITY [J].

BARDEEN, J ;

COOPER, LN ;

SCHRIEFFER, JR .

PHYSICAL REVIEW, 1957, 108 (05) :1175-1204

[3] INFLUENCE OF MOLYBDENUM - SUBSTITUTION ON SUPERCONDUCTIVITY OF YTTRIUM BARIUM CUPRATE [J].

BHALODIA, JA ;

SHAIKH, IA ;

KUBERKAR, DG ;

BALDHA, GJ ;

KULKARNI, RG .

MATERIALS RESEARCH BULLETIN, 1994, 29 (01) :89-95

[4] ROLE OF BA-SITE PR IN QUENCHING SUPERCONDUCTIVITY OF Y1-YPRYBA2CU3OX AND RELATED MATERIALS [J].

BLACKSTEAD, HA ;

DOW, JD .

PHYSICAL REVIEW B, 1995, 51 (17) :11830-11837

[5]

EGI T, 1997, IN PRESS PHYSICA C

[6] SUPERCONDUCTIVITY OF RARE EARTH-BARIUM-COPPER OXIDES [J].

FISK, Z ;

THOMPSON, JD ;

ZIRNGIEBL, E ;

SMITH, JL ;

CHEONG, SW .

SOLID STATE COMMUNICATIONS, 1987, 62 (11) :743-744

[7] ELECTRONIC-STRUCTURE, CHARGE-TRANSFER EXCITATIONS AND HIGH-TEMPERATURE SUPERCONDUCTIVITY [J].

FREEMAN, AJ ;

YU, J ;

MASSIDDA, S ;

KOELLING, DD .

PHYSICA B & C, 1987, 148 (1-3) :212-217

[8] SUPERCONDUCTIVITY ABOVE 90 K IN THE SQUARE-PLANAR COMPOUND SYSTEM ABA2CU3O6+X WITH A = Y, LA, ND, SM, EU, GD, HO, ER, AND LU [J].

HOR, PH ;

MENG, RL ;

WANG, YQ ;

GAO, L ;

HUANG, ZJ ;

BECHTOLD, J ;

FORSTER, K ;

CHU, CW .

PHYSICAL REVIEW LETTERS, 1987, 58 (18) :1891-1894

[9] NEUTRON POWDER DIFFRACTION STUDY OF THE CRYSTAL-STRUCTURE OF YSR2COCU2O7 AND Y1-XCAXSR2COCU2O7 [J].

HUANG, Q ;

CAVA, RJ ;

SANTORO, A ;

KRAJEWSKI, JJ ;

PECK, WF .

PHYSICA C, 1992, 193 (1-2) :196-206

[10] STRUCTURAL-PROPERTIES OF OXYGEN-DEFICIENT YBA2CU3O7-DELTA [J].

JORGENSEN, JD ;

VEAL, BW ;

PAULIKAS, AP ;

NOWICKI, LJ ;

CRABTREE, GW ;

CLAUS, H ;

KWOK, WK .

PHYSICAL REVIEW B, 1990, 41 (04) :1863-1877

← 1 2 3 →