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

S. Endo; Y. Watanabe; T. Sasaki; T. Fukase; N. Toyota

doi:10.1016/s0379-6779(97)81003-x

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

S. Endo, Y. Watanabe, T. Sasaki, T. Fukase, N. Toyota

Institute for Materials Research (IMR) (institute affiliation only)

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

The temperature dependence oflattice parameters in an isostructural series of α-(BEDT-TTF)₂MHg(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 c/a 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.

Original language	English
Pages (from-to)	2013-2014
Number of pages	2
Journal	Synthetic Metals
Volume	86
Issue number	1-3
DOIs	https://doi.org/10.1016/s0379-6779(97)81003-x
Publication status	Published - 1997 Feb 28

Keywords

Diffraction and scattering
Organic conductors based on radical cation and/or anion salts
Organic superconductors
X-ray emission

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

Access to Document

10.1016/s0379-6779(97)81003-x

Cite this

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

abstract = "The temperature dependence oflattice parameters in an isostructural series of α-(BEDT-TTF)2MHg(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 c/a 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.",

keywords = "Diffraction and scattering, Organic conductors based on radical cation and/or anion salts, Organic superconductors, X-ray emission",

author = "S. Endo and Y. Watanabe and T. Sasaki and T. Fukase and N. Toyota",

year = "1997",

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doi = "10.1016/s0379-6779(97)81003-x",

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TY - JOUR

T1 - Temperature dependence of lattice parameters of α-(BEDT-TTF)2MHg(XCN)4 (M=K, Rb, NH4, and X=S, Se)

AU - Endo, S.

AU - Watanabe, Y.

AU - Sasaki, T.

AU - Fukase, T.

AU - Toyota, N.

PY - 1997/2/28

Y1 - 1997/2/28

N2 - The temperature dependence oflattice parameters in an isostructural series of α-(BEDT-TTF)2MHg(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 c/a 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.

AB - The temperature dependence oflattice parameters in an isostructural series of α-(BEDT-TTF)2MHg(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 c/a 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.

KW - Diffraction and scattering

KW - Organic conductors based on radical cation and/or anion salts

KW - Organic superconductors

KW - X-ray emission

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U2 - 10.1016/s0379-6779(97)81003-x

DO - 10.1016/s0379-6779(97)81003-x

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VL - 86

SP - 2013

EP - 2014

JO - Synthetic Metals

JF - Synthetic Metals

IS - 1-3

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