TEMPERATURE-DEPENDENCE OF THE POSITRON-ANNIHILATION PARAMETERS IN BI2-XPBXCA2SR2CU3OY AND BI2CASR2CU2OY SUPERCONDUCTORS

被引：19

作者：

PUJARI, PK ^{[1
]}

DATTA, T ^{[1
]}

DE, U ^{[1
]}

GHOSH, B ^{[1
]}

机构：

[1] VARIABLE ENERGY CYCLOTRON CTR,CALCUTTA 700064,INDIA

来源：

PHYSICAL REVIEW B | 1994年 / 50卷 / 05期

关键词：

D O I：

10.1103/PhysRevB.50.3438

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the results of temperature dependence of S-parameter and lifetime (tau) measurements on the normal and superconducting states of Bi2CaSr2Cu2Oy (Bi-2:1:2:2) and Bi2-xPbxCa2Sr2Cu3Oy (Bi-2:2:2:3) superconductors. A decrease of the S parameter as well as tau below T(c) is seen for both compounds. These observations are interpreted qualitatively considering a reported positron-density-distribution calculation and invoking the local charge-transfer process from CuO2 to Bi-O planes at the onset of the superconducting transition. The possible influence of sample preparation conditions and structural changes on the temperature dependencies of the positron annihilation parameters across T(c) is also discussed.

引用

页码：3438 / 3441

页数：4

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