EVOLUTION OF SUPERCONDUCTIVITY IN CA DOPED C-60 PREPARED FROM AZIDE - LOW-FIELD MICROWAVE-ABSORPTION AND ESR

被引：7

作者：

ARAKI, H ^{[1
]}

YAMASAKI, N ^{[1
]}

ZAKHIDOV, AA ^{[1
]}

YOSHINO, K ^{[1
]}

机构：

[1] OSAKA UNIV,FAC ENGN,DEPT ELECTR ENGN,SUITA,OSAKA 565,JAPAN

来源：

PHYSICA C | 1994年 / 233卷 / 3-4期

关键词：

D O I：

10.1016/0921-4534(94)90749-8

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Superconducting (SC) behavior of Ca doped C-60 prepared by calcium azide thermal decomposition is studied by low-field signal (LFS) microwave absorption and conventional ESR. SC phase is obtained for the sample prepared with nominal composition of Ca6C60 and its volume fraction is significantly enlarged by annealing at 350-400 degrees C for 2 h. It is suggested that the SC compound may have two SC phases with slightly different transition temperatures, T-c1(8.2-8.4 K) and T-c2(8.7-8.8 K). The SC2 phase vcith higher T-C2 is degraded by annealing at 450-500 degrees C and converts to SC1. Degradation of SC2 at high temperature is interpreted to be caused either by (1) thermal reaction of some intercalated Ca with quartz glass and/or (2) dissociation of (Ca-N)(y) or N-y clusters in the octahedral sites of the Ca-5(Ca-N)(y)C-60 or Ca5NyC60 lattice.

引用

页码：242 / 246

页数：5

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