Magnetic properties of coexistent system of itinerant and localized electrons, (BEDT-TTF)(2)MCo(SCN)(4) (M=K, Rb, Cs)

被引:18
作者
Mori, H [1 ]
Tanaka, S [1 ]
Mori, T [1 ]
机构
[1] TOKYO INST TECHNOL, DEPT ORGAN & POLYMER MAT, TOKYO 152, JAPAN
来源
JOURNAL DE PHYSIQUE I | 1996年 / 6卷 / 12期
关键词
D O I
10.1051/jp1:1996194
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
A coexistent system of itinerant and localized electrons was prepared and the magnetic properties of both electrons were investigated. alpha-(BEDT-TTF)(2)CsCo(SCN)(4) (abbreviated as the CsCo salt), alpha-(BEDT-TTF)(2)RbCo(SCN)(4) (the RbCo salt), and alpha ''-(BEDT-TTF)(2) K1.4Co(SCN)(4) (the KCo salt), undergo metal-insulator transitions at 20 K, 190 K, and 130 K, respectively. The ESR measurement of the RbCo salt indicates that the electronic state below transition temperature, 190 K, is magnetic insulator due to the strong electron correlation. The static magnetic susceptibility of the CsCo salt measured by SQUID is mostly originated from the localized electrons, Co2+ (S = 3/2), and obeys the Curie-Weiss law with theta = -3 K above 20 K, where the weak interaction between Co2+ might be caused by the superexchange through coordinated SCN- anion. Below 20 K, the rapid decrease of chi T is observed because of the crystal field around Co2+.
引用
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页码:1987 / 1996
页数:10
相关论文
共 28 条
[1]  
Carlin R. L., 1986, MAGNETOCHEMISTRY
[2]   ELECTRONIC STRUCTURES OF TETRAHEDRAL COBALT(II) COMPLEXES [J].
COTTON, FA ;
GOODGAME, M ;
GOODGAME, DM .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1961, 83 (23) :4690-&
[3]   New BEDT-TTF salts with transition-metal containing anions [J].
Fat, P. ;
Graham, A.W. ;
Kepert, C.J. ;
Kurmoo, M. .
Synthetic Metals, 1995, 70 (1 -3 pt 2) :767-770
[4]   PARAMAGNETIC ANISOTROPIES + LIGAND FIELDS OF TETRAHEDRAL COBALTOUS CHLORIDES + THIOCYANATE [J].
FIGGIS, BN ;
MASON, R ;
GERLOCH, M .
PROCEEDINGS OF THE ROYAL SOCIETY OF LONDON SERIES A-MATHEMATICAL AND PHYSICAL SCIENCES, 1964, 279 (1376) :210-+
[5]   ANGULAR AND MAGNETIC-FIELD DEPENDENCIES OF THE MAGNETORESISTANCE OF LAMBDA-(BETS)(2)FECL4 IN THE FIELD-RESTORED HIGH-CONDUCTIVITY STATE [J].
GOZE, F ;
LAUKHIN, VN ;
BROSSARD, L ;
AUDOUARD, A ;
ULMET, JP ;
ASKENAZY, S ;
NAITO, T ;
KOBAYASHI, H ;
KOBAYASHI, A ;
TOKUMOTO, M ;
CASSOUX, P .
PHYSICA B, 1995, 211 (1-4) :290-292
[6]   MAGNETOTRANSPORT MEASUREMENT ON THE LAMBDA-PHASE OF THE ORGANIC CONDUCTORS (BETS)2MCL4 (M=GA, FE) - MAGNETIC-FIELD-RESTORED HIGHLY CONDUCTING STATE IN LAMBDA(BETS)2FECL4 [J].
GOZE, F ;
LAUKHIN, VN ;
BROSSARD, L ;
AUDOUARD, A ;
ULMET, JP ;
ASKENAZY, S ;
NAITO, T ;
KOBAYASHI, H ;
KOBAYASHI, A ;
TOKUMOTO, M ;
CASSOUX, P .
EUROPHYSICS LETTERS, 1994, 28 (06) :427-431
[7]   TOWARD A THEORY OF SPECTRAL AND MAGNETIC-PROPERTIES OF TRANSITION-METAL IONS OCCUPYING LOW-SYMMETRY SITES IN METALLOPROTEINS - APPLICATION OF ANGULAR OVERLAP MODEL TO DISTORTED TETRAHEDRAL COCL42-IONS [J].
HORROCKS, WD ;
BURLONE, DA .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1976, 98 (21) :6512-6516
[8]   A THEORY OF METALLIC FERROMAGNETISM AND ANTIFERROMAGNETISM ON ZENERS MODEL [J].
KASUYA, T .
PROGRESS OF THEORETICAL PHYSICS, 1956, 16 (01) :45-57
[9]  
KASUYA T, 1954, PROG THEOR PHYS, V16, P48
[10]   PARTIALLY SUPERCONDUCTING BEHAVIOR OF THETA-(BEDT-TTF)2(I3)1-X(AUI2)X, (BEDT-TTF)2(I3)1-X(I2BR) SYSTEM [J].
KATO, R ;
KOBAYASHI, H ;
KOBAYASHI, A ;
NISHIO, Y ;
KAJITA, K ;
SASAKI, W .
CHEMISTRY LETTERS, 1986, (06) :957-960