Effect of External Pressure on the Metal-Insulator Transition of the Organic Quasi-Two-Dimensional Metal κ-(BEDT-TTF)2Hg(SCN)2Br

被引:1
作者
Pesotskii, Sergei I. [1 ]
Lyubovskii, Rustem B. [1 ]
Shilov, Gennady V. [1 ]
Zverev, Vladimir N. [2 ]
Torunova, Svetlana A. [1 ]
Zhilyaeva, Elena I. [1 ]
Canadell, Enric [3 ]
机构
[1] Russian Acad Sci, Fed Res Ctr Problems Chem Phys & Med Chem, Moscow 142432, Russia
[2] Russian Acad Sci, Inst Solid State Phys, Chernogolovka 142432, Russia
[3] ICMAB, CSIC, Inst Ciencia Mat Barcelona, Campus UAB, Bellaterra 08193, Spain
基金
俄罗斯基础研究基金会;
关键词
organic conductors; crystal structure; phase transition; band structures; Fermi surface; conductivity; magnetoresistance; ELECTRONIC-PROPERTIES; CRYSTAL-STRUCTURE; SERIES; STATE;
D O I
10.3390/magnetochemistry8110152
中图分类号
O61 [无机化学];
学科分类号
070301 ; 081704 ;
摘要
The metal-insulator transition in the organic quasi-two-dimensional metal K-(BEDTTTF)(2)Hg(SCN)(2) Br at T-MI approximate to 90 K has been investigated. The crystal structure changes during this transition from monoclinic above T MI to triclinic below T-MI. A theoretical study suggested that this phase transition should be of the metal-to-metal type and brings about a substantial change of the Fermi surface. Apparently, the electronic system in the triclinic phase is unstable toward a Mott insulating state, leading to the growth of the resistance when the temperature drops below T-MI approximate to 90 K. The application of external pressure suppresses the Mott transition and restores the metallic electronic structure of the triclinic phase. The observed quantum oscillations of the magnetoresistance are in good agreement with the calculated Fermi surface for the triclinic phase, providing a plausible explanation for the puzzling behavior of K-(BEDT-TTF)(2)Hg(SCN)(2) Br as a function of temperature and pressure around 100 K. The present study points out interesting differences in the structural and physical behaviors of the two room temperature isostructural salts of K-(BEDT-TTF)(2)Hg(SCN)(2)X with X = Br, Cl.
引用
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页数:10
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