Structure, superconductivity and thermopower of Nd1-xPrxSrBaCu3O7

被引：6
作者：
Das, A
Suryanarayanan, R
Zelenay, I
Dabrowski, B
机构：
[1] UNIV PARIS 11, LAB CHIM SOLIDES, UA446, CNRS, F-91405 ORSAY, FRANCE
[2] CNRS, PHYS SOLIDES LAB, F-92195 MEUDON, FRANCE
[3] SLOVAK UNIV TECHNOL BRATISLAVA, DEPT PHYS, BRATISLAVA 81219, SLOVAKIA
[4] NO ILLINOIS UNIV, DEPT PHYS, DE KALB, IL 60115 USA
来源：
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS | 1997年 / 273卷 / 3-4期
关键词：
ac susceptibility; thermoelectric power; substitution effects; hole concentration; Pr-f hybridization; high pressure annealing;
D O I：
10.1016/S0921-4534(96)00633-8
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
We report on the preparation, X-ray diffraction, ac susceptibility and thermopower (S) of Nd1-xPrxSrBaCu3O7 (0 less than or equal to x less than or equal to 0.5). Two sets of samples were studied: synthesised in air and annealed in oxygen [AO] and heated in argon followed by annealing in oxygen [AO]. Superconductivity was suppressed for x greater than or equal to 0.5 whatever be the heat treatment, though for x < 0.5, the T-c values of the samples [AO] were higher. The thermopower data show all samples are underdoped compared to YBa2Cu3O7 and the hole density decreases as x(Pr) increases. Two samples, Nd0.7Pr0.3Ba1.85Sr0.15Cu3O7 and Nd0.7Pr0.3Ba0.5Sr0.5Cu3O7 that were annealed in high pressure oxygen (200 bar) showed an increase of T-c from 0 to 29 and from 26 to 35 K respectively. The influence of chain oxygen defects on T-c is pointed out.
引用
收藏
页码：301 / 308
页数：8
相关论文
共 34 条
[1]  
BIAGINI M, 1995, PHYS REV B, V52
[2]   SUPERCONDUCTIVITY IN PRBA2CU3O7 [J].
BLACKSTEAD, HA ;
CHRISEY, DB ;
DOW, JD ;
HORWITZ, JS ;
KLUNZINGER, AE ;
PULLING, DB .
PHYSICS LETTERS A, 1995, 207 (1-2) :109-112
[3]   IMPLICATIONS OF ABRIKOSOV-GORKOV EXCHANGE SCATTERING FOR THEORIES OF HIGH-TEMPERATURE SUPERCONDUCTIVITY [J].
BLACKSTEAD, HA ;
DOW, JD .
PHYSICS LETTERS A, 1995, 206 (1-2) :107-110
[4]   THE SUPPRESSION OF SUPERCONDUCTIVITY IN THE GD1-XPRXBA2-YSRYCU3O7-DELTA SYSTEM [J].
CAO, GH ;
QIAN, YT ;
LI, XJ ;
WU, HK ;
CHEN, ZY ;
ZHANG, YH .
PHYSICA C, 1995, 248 (1-2) :92-96
[5]  
CAO GH, 1994, PHYS LETT A, V196, P263, DOI 10.1016/0375-9601(94)91237-8
[6]   PR-O CHEMICAL BONDING EFFECT AND PR VALENCE STATE IN PRBA2CU3O7 - A COMPREHENSIVE STRUCTURAL-CORRELATION STUDY [J].
CAO, GH ;
QIAN, YT ;
CHEN, ZY ;
ZHANG, YH .
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS, 1995, 56 (07) :981-988
[7]   ORTHORHOMBIC TO TETRAGONAL TRANSITION AND APPEARANCE OF SUPERCONDUCTIVITY IN ND0.7PR0.3BA2-KSRKCU3O6+Z (0-LESS-THAN-OR-EQUAL-TO-K-LESS-THAN-OR-EQUAL-TO-1) [J].
DAS, A ;
SURYANARAYANAN, R .
MATERIALS RESEARCH BULLETIN, 1995, 30 (11) :1363-1370
[8]   EVIDENCE FOR RETARDED PR F-HYBRIDIZATION AND T-C SUPPRESSION IN Y1-XPRXSR2CU2.85RE0.15O7 [J].
DAS, A ;
CASTRO, LF ;
ZELENAY, I ;
SURYANARAYANAN, R .
JOURNAL OF SOLID STATE CHEMISTRY, 1995, 118 (01) :215-218
[9]  
DAS A, 1995, J PHYS I, V5, P623, DOI 10.1051/jp1:1995155
[10]  
DAS A, IN PRESS SOLID STATE
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