Systematic study of the electronic state in θ-type BEDT-TTF organic conductors by changing the electronic correlation
Systematic study of the electronic state in θ-type BEDT-TTF organic conductors by changing the electronic correlation
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DOI：
10.1103/physrevb.57.12023
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发表时间：
1998-05-15
影响因子：
3.7
通讯作者：
Mori, T
中科院分区：
文献类型：
--
作者：
Mori, H;Tanaka, S;Mori, T
本文研究了我们新近合成的θ型BEDT-TTF [BEDT-TTF：bis（ethylenedithio）tetrathiafulvalene，简称ET]盐的相变行为，它涉及系列θ-（BEDT-TTF）（2）MM '（SCN）（4）[M=Tl，Rb，CS，M' =Co，Zn：简称theta-MM ']。电子相关参数（U/t）随着二面角（θ）的增大而增大。在θ-ET盐的相图中，随着θ的减小，即U/t，基态从绝缘到超导再到金属。系列theta-MM'位于相图的中心，其中在低温下观察到金属态、顺磁绝缘态和单重态。随着压力的增加，由于二面角的增大，金属-绝缘体转变温度升高，这与电子关联的增强有关。[S0163-1829（98）03919-8]。
The behavior of the phase transitions is mapped out as a function of the dihedral-angle (theta) or the transfer integral (t) between donor columns for theta-type BEDT-TTF [BEDT-TTF: bis(ethylenedithio)tetrathiafulvalene, abbreviated as ET] salts involving the series theta-(BEDT-TTF)(2)MM'(SCN)(4) [M=Tl,Rb,CS, M' =Co,Zn: abbreviated as theta-MM'], which we have recently prepared. The electronic correlation parameter(U/t) increases by increasing the dihedral angle (theta). In the phase diagram of theta-ET salts the ground state varies from insulating, to superconducting, to metallic with decreasing theta,namely, U/t. The series theta-MM' is located at the center of the phase diagram where metallic, paramagnetic insulating, and singlet states are observed at low temperatures. With applied pressure, the metal-insulator transition temperature rises because the dihedral angle increases,which is related to the enhancement of the electronic correlation. [S0163-1829(98)03919-8].