ESR AND LOW-FIELD MICROWAVE-ABSORPTION STUDIES OF POTASSIUM DOPED C-70 - OBSERVATION OF POSSIBLE METALLIC STATE IN KXC70

被引：14

作者：

IMAEDA, K ^{[1
]}

YAKUSHI, K ^{[1
]}

INOKUCHI, H ^{[1
]}

KIKUCHI, K ^{[1
]}

IKEMOTO, I ^{[1
]}

SUZUKI, S ^{[1
]}

ACHIBA, Y ^{[1
]}

机构：

[1] TOKYO METROPOLITAN UNIV,DEPT CHEM,HACHIOJI,TOKYO 19203,JAPAN

来源：

SOLID STATE COMMUNICATIONS | 1992年 / 84卷 / 11期

关键词：

D O I：

10.1016/0038-1098(92)90431-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The magnetic property of KxC70 upon K doping process was investigated by electron spin resonance (ESR) and low-magnetic field microwave absorption (low-field signal: LFS). In the early stage of K doping (doping time t(d) < 40 h), ESR signal with a Curie-like behavior was observed, which means an insulating state of a doped phase in this stage. In t(d) > 40 h, ESR spectra broadened suddenly and the almost temperature-independent behavior of ESR intensity appeared in the high temperature region. This suggests a change from an insulating KxC70 phase to a metallic KxC70 phase. The chemical analysis has presented that the insulating phase corresponds to K3C70 and the metallic phase corresponds to K4C70. A very weak LFS below ca. 9 K was observed in the doping stage of t(d) greater-than-or-equal-to 10 h, indicating the coexistence of a small volume of some superconducting phase. A possible origin of the superconducting phase is described.

引用

页码：1019 / 1024

页数：6

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