NEW ORGANIC SUPERCONDUCTOR, LAMBDA-(BETS)(2)GACL4 AND METAL-INSULATOR-TRANSITION OF BETS CONDUCTOR WITH MAGNETIC ANIONS (BETS=BIS(ETHLENEDITHIO)TETRASELENAFULVALENE)

被引：37

作者：

KOBAYASHI, H ^{[1
]}

TOMITA, H ^{[1
]}

UDAGAWA, T ^{[1
]}

NAITO, T ^{[1
]}

KOBAYASHI, A ^{[1
]}

机构：

[1] UNIV TOKYO,FAC SCI,DEPT CHEM,BUNKYO KU,TOKYO 113,JAPAN

来源：

SYNTHETIC METALS | 1995年 / 70卷 / 1-3期

关键词：

D O I：

10.1016/0379-6779(94)02683-P

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Crystal structures and electronic properties of BETS compounds with tetrahedral anions, MX(4) (BETS=bis(ethylenedithio)tetraselenafulvalene: M=Ga; Fe, In; X=Cl, Br) were examined. The salts can be classified into two types (kappa, lambda). All the compounds with so-called kappa-type molecular arrangements retained metallic behavior down to 4 K. lambda-(BETS)(2)GaCl4 demonstrated a a superconducting transition around 8 K. Whereas lambda-(BETS)(2)FeCl4 with the isomorphic h-type structure exhibited a sharp metal-insulator transition at 8 K. Low-temperature X-ray studies showed that the structural difference between lambda-GaCl4 and lambda-FeCl4 salts is very small. The structure analysis of kappa-(BETS)(2)FeCl4 at 18 K indicated that the FeCl4 anion has approximately C-3v symmetry. The ESR measurements revealed the high-spin state of Fe3+ in lambda-FeCl4 salt and and low-spin state in kappa-FeCl4 salt. ESR intensities of kappa- and lambda-FeCl4 salts suggested antiferromagnetic interaction between Fe3+ ions.

引用

页码：867 / 870

页数：4

共 7 条

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GOZE F, IN PRESS

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