ROLE OF CALCIUM IN SUPPRESSING THE SUPERCONDUCTIVITY OF Y1-XCAXBA2CU3O7-DELTA

被引:76
作者
AWANA, VPS
NARLIKAR, AV
机构
[1] National Physical Laboratory, New Delhi 110012, Dr. K. S. Krishnan Road
来源
PHYSICAL REVIEW B | 1994年 / 49卷 / 09期
关键词
D O I
10.1103/PhysRevB.49.6353
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Partial substitution of Ca2+ at the Y3+ site in the YBa2Cu3O7-delta system shows several interesting features, namely (1) creation of oxygen vacancies without any change in the lattice parameters, (2) no change in the effective copper valence, and (3) decrease in the critical temperature T(c) with substitution, accompanied by a decrease in the normal-state conductivity. A host of measurements such as low-temperature resistivity, magnetic susceptibility, x-ray diffraction, oxygen stoichiometry, and the effective copper valence, reported here, suggest that T(c) depression with Ca substitution is unlikely to be due to an overdoping effect. An alternate explanation, which takes stock of the above observations, and involves the creation of disorder in CuO2 planes, is invoked.
引用
收藏
页码:6353 / 6355
页数:3
相关论文
共 14 条
[11]   NEW PROCEDURE FOR DETERMINATION OF [CU-O]+P CHARGE AND OXYGEN-CONTENT IN HIGH-TC COPPER OXIDES [J].
NAZZAL, AI ;
LEE, VY ;
ENGLER, EM ;
JACOWITZ, RD ;
TOKURA, Y ;
TORRANCE, JB .
PHYSICA C, 1988, 153 :1367-1368
[12]   SUPERCONDUCTIVITY AT 40-K IN THE OXYGEN-DEFECT PEROVSKITES LA2-XSRXCUO4-Y [J].
TARASCON, JM ;
GREENE, LH ;
MCKINNON, WR ;
HULL, GW ;
GEBALLE, TH .
SCIENCE, 1987, 235 (4794) :1373-1376
[13]  
TELLON JL, 1993, PHYSICA C, V204, P237
[14]   UNIVERSAL RELATIONSHIP BETWEEN TC AND THE HOLE CONTENT IN P-TYPE CUPRATE SUPERCONDUCTORS [J].
ZHANG, HB ;
SATO, HS .
PHYSICAL REVIEW LETTERS, 1993, 70 (11) :1697-1699