Temperature dependence of lattice parameters of alpha-(BEDT-TTF)(2)MHg(XCN)(4)(M=K, Rb, NH4, and X=S, Se)

被引：17

作者：

Endo, S ^{[1
]}

Watanabe, Y ^{[1
]}

Sasaki, T ^{[1
]}

Fukase, T ^{[1
]}

Toyota, N ^{[1
]}

机构：

[1] TOHOKU UNIV,INST MAT RES,SENDAI,MIYAGI 98077,JAPAN

来源：

SYNTHETIC METALS | 1997年 / 86卷 / 1-3期

关键词：

organic conductors based on radical cation and/or anion salts; organic superconductors; X-ray emission; diffraction and scattering;

D O I：

10.1016/S0379-6779(97)81003-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The temperature dependence of lattice parameters in an isostructural series of alpha-(BEDT-TTF)(2)MHg(XCN)(4) (M=K, Rb, NH4: X=S, Se) has been studied from room temperature down to 11K by four-circle X-Ray diffraction measurements on single crystals. Only the superconducting NH4Hg(SCN)(4) salt shows a significant increase in the anisotropy ratio of cia from 0.985 to 0.975 in the temperature range of 200K-50K, while all the other salts exhibiting a normal metallic or antiferromagnetic spin-density-wave ground state have the ratio of 0.990-0.985 almost independent of temperature. This difference in the in-plane lattice contraction could induce a topological difference of the Fermi surface at low temperature, via differently modulated transfer integrals.

引用

页码：2013 / 2014

页数：2

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[2]

BROOKS JB, 1996, PHYSICAL PHENOMENA H, V2, P282

[3] PRESSURE EFFECTS ON THE ELECTRONIC-STRUCTURE AND LOW-TEMPERATURE STATES IN THE ALPHA-(BEDT-TTF)(2)MHG(SCN)(4) ORGANIC-CONDUCTOR FAMILY (M=K,RB,TL,NH4) [J].