Thermal study of reentrant metal-insulator transition in deuterated (DMe-DCQNI)(2)Cu

被引:2
作者
Someya, N
Nishio, Y
Tamura, M
Kajita, K
Aonuma, S
Sawa, H
Kato, R
Kobayashi, H
机构
[1] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN
[2] INST MOL SCI,OKAZAKI,AICHI 444,JAPAN
关键词
metal-insulator transition; specific heat; latent heat; DCNQI; Cu2+; antiferromagnetic ordering;
D O I
10.1016/S0379-6779(97)81035-1
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have investigated thermal properties (specific heat and latent heat) of selectively deuterated (DMe-DCNQI)(2)Cu in the temperature region (0.5K<T<100K) with the particular interest in the mechanism of mysterious reentrant metal-insulator transition. Specific heat steeply reduces as crossing from higher temperature metallic states (HM) to insulator states (I). We have succeeded in precisely determining the latent heat at the HM-I transition. In metallic phase, the electron entropy has the linear temperature dependence like gamma T term. We clarified that the competition between these gamma T contributions in metallic phase and freedom of Cu2+ spins in insulator phase drives the reentrant M-I transition.
引用
收藏
页码:2077 / 2078
页数:2
相关论文
共 9 条
[1]   SYNTHESIS OF DME-DCNQI-D7 AND DEUTERIUM-INDUCED METAL-INSULATOR-TRANSITION OF (DME-DCNQI-D7)2CU [J].
AONUMA, S ;
SAWA, H ;
OKANO, Y ;
KATO, R ;
KOBAYASHI, H .
SYNTHETIC METALS, 1993, 58 (01) :29-38
[2]   PREPARATION AND PHYSICAL-PROPERTIES OF AN ALLOYED (DME-DCNQI)2CU WITH FULLY DEUTERATED DME-DCNQI (DME-DCNQI=2,5-DIMETHYL-N,N'-DICYANOQUINONEDIIMINE) [J].
KATO, R ;
SAWA, H ;
AONUMA, S ;
TAMURA, M ;
KINOSHITA, M ;
KOBAYASHI, H .
SOLID STATE COMMUNICATIONS, 1993, 85 (10) :831-835
[3]   METAL-INSULATOR-TRANSITION IN DCNQI-CU [J].
NAKANO, M ;
KATO, M ;
YAMADA, K .
PHYSICA B-CONDENSED MATTER, 1993, 186-88 :1077-1079
[4]   THERMAL AND MAGNETIC-PROPERTIES IN ORGANIC METALS (DME-DCNQI)2CU, (DMEO-DCNQI)2CU AND (DME1-XMEBRX-DCNQI)2CU - ENHANCEMENT OF DENSITY OF STATES [J].
NISHIO, Y ;
KAJITA, K ;
SASAKI, W ;
KATO, R ;
KOBAYASHI, A ;
KOBAYASHI, H .
SOLID STATE COMMUNICATIONS, 1992, 81 (06) :473-476
[5]  
NISHIO Y, IN PRESS
[6]  
SAWA H, COMMUNICATION
[7]   METAL-INSULATOR-TRANSITION IN ORGANIC CONDUCTOR DCNQI-CU SALT [J].
SUZUMURA, Y ;
OGAWA, T .
SYNTHETIC METALS, 1995, 70 (1-3) :1083-1084
[8]   MAGNETIC-PROPERTIES OF DCNQI-CU SYSTEMS [J].
TAMURA, M ;
SAWA, H ;
KASHIMURA, Y ;
AONUMA, S ;
KATO, R ;
KINOSHITA, M ;
KOBAYASHI, H .
SYNTHETIC METALS, 1995, 70 (1-3) :1081-1082
[9]  
VONSCHUTZ JU, 1988, SYNTHETIC MET, V27, pB249, DOI 10.1016/0379-6779(88)90152-X