Fermi Surfaces and Crystal Structure of a New Organic Conductor α-(BEDT-TTF)2KHg(SeCN)4

Takahiko Sasaki; Hiroaki Ozawa; Hatsumi Mori; Shoji Tanaka; Tetsuo Fukase; Naoki Toyota

doi:10.1143/JPSJ.65.213

Fermi Surfaces and Crystal Structure of a New Organic Conductor α-(BEDT-TTF)₂KHg(SeCN)₄

Takahiko Sasaki, Hiroaki Ozawa, Hatsumi Mori, Shoji Tanaka, Tetsuo Fukase, Naoki Toyota

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

28 Citations (Scopus)

Abstract

We have synthesized a new organic conductor α(BEDT-TTF)₂KHg(SeCN)₄which is found to be isostructural with a family of α-(BEDT-TTF)₂MHg(SCN)₄ with M=K, Tl, Rb and NH⁴, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In contrast to superconducting (M=NH₄) or antiferromagnetic (M=K, Tl, Rb) salts, the title compound remains a normal metal in the same way as α-(BEDT-TTF)₂TlHg(SeCN)₄. The magnetoresistance and the Shubnikovde Haas (SdH) effect have been measured at temperatures down to 0.5K and magnetic fields up to 23T. The SdH frequency of 670T, the effective mass of 2.0m₀, and the Dingle temperature of L.6K are obtained in fields perpendicular to the conductive a-c plane. The magnetic field direction dependence of the frequency shows that the observed Fermi surface has a cylindrical shape. The temperature and the field dependence of the SdH oscillation amplitude are well explained by the standard Lifshitz-Kosevich formulation, indicating that the effective mass is essentially constant up to 23T.

Original language	English
Pages (from-to)	213-220
Number of pages	8
Journal	journal of the physical society of japan
Volume	65
Issue number	1
DOIs	https://doi.org/10.1143/JPSJ.65.213
Publication status	Published - 1996

Keywords

Crystal structure
Fermi surface
Magnetoresistance
Organic conductor
Shubnikovde Haas effect
α-(BEDT-TTF)KHg(SeCN)

ASJC Scopus subject areas

Physics and Astronomy(all)

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title = "Fermi Surfaces and Crystal Structure of a New Organic Conductor α-(BEDT-TTF)2KHg(SeCN)4",

abstract = "We have synthesized a new organic conductor α(BEDT-TTF)2KHg(SeCN)4which is found to be isostructural with a family of α-(BEDT-TTF)2MHg(SCN)4 with M=K, Tl, Rb and NH4, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In contrast to superconducting (M=NH4) or antiferromagnetic (M=K, Tl, Rb) salts, the title compound remains a normal metal in the same way as α-(BEDT-TTF)2TlHg(SeCN)4. The magnetoresistance and the Shubnikovde Haas (SdH) effect have been measured at temperatures down to 0.5K and magnetic fields up to 23T. The SdH frequency of 670T, the effective mass of 2.0m0, and the Dingle temperature of L.6K are obtained in fields perpendicular to the conductive a-c plane. The magnetic field direction dependence of the frequency shows that the observed Fermi surface has a cylindrical shape. The temperature and the field dependence of the SdH oscillation amplitude are well explained by the standard Lifshitz-Kosevich formulation, indicating that the effective mass is essentially constant up to 23T.",

keywords = "Crystal structure, Fermi surface, Magnetoresistance, Organic conductor, Shubnikovde Haas effect, α-(BEDT-TTF)KHg(SeCN)",

author = "Takahiko Sasaki and Hiroaki Ozawa and Hatsumi Mori and Shoji Tanaka and Tetsuo Fukase and Naoki Toyota",

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T1 - Fermi Surfaces and Crystal Structure of a New Organic Conductor α-(BEDT-TTF)2KHg(SeCN)4

AU - Sasaki, Takahiko

AU - Ozawa, Hiroaki

AU - Mori, Hatsumi

AU - Tanaka, Shoji

AU - Fukase, Tetsuo

AU - Toyota, Naoki

PY - 1996

Y1 - 1996

N2 - We have synthesized a new organic conductor α(BEDT-TTF)2KHg(SeCN)4which is found to be isostructural with a family of α-(BEDT-TTF)2MHg(SCN)4 with M=K, Tl, Rb and NH4, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In contrast to superconducting (M=NH4) or antiferromagnetic (M=K, Tl, Rb) salts, the title compound remains a normal metal in the same way as α-(BEDT-TTF)2TlHg(SeCN)4. The magnetoresistance and the Shubnikovde Haas (SdH) effect have been measured at temperatures down to 0.5K and magnetic fields up to 23T. The SdH frequency of 670T, the effective mass of 2.0m0, and the Dingle temperature of L.6K are obtained in fields perpendicular to the conductive a-c plane. The magnetic field direction dependence of the frequency shows that the observed Fermi surface has a cylindrical shape. The temperature and the field dependence of the SdH oscillation amplitude are well explained by the standard Lifshitz-Kosevich formulation, indicating that the effective mass is essentially constant up to 23T.

AB - We have synthesized a new organic conductor α(BEDT-TTF)2KHg(SeCN)4which is found to be isostructural with a family of α-(BEDT-TTF)2MHg(SCN)4 with M=K, Tl, Rb and NH4, where BEDT-TTF is bis(ethylenedithio)tetrathiafulvalene. In contrast to superconducting (M=NH4) or antiferromagnetic (M=K, Tl, Rb) salts, the title compound remains a normal metal in the same way as α-(BEDT-TTF)2TlHg(SeCN)4. The magnetoresistance and the Shubnikovde Haas (SdH) effect have been measured at temperatures down to 0.5K and magnetic fields up to 23T. The SdH frequency of 670T, the effective mass of 2.0m0, and the Dingle temperature of L.6K are obtained in fields perpendicular to the conductive a-c plane. The magnetic field direction dependence of the frequency shows that the observed Fermi surface has a cylindrical shape. The temperature and the field dependence of the SdH oscillation amplitude are well explained by the standard Lifshitz-Kosevich formulation, indicating that the effective mass is essentially constant up to 23T.

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KW - Fermi surface

KW - Magnetoresistance

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KW - Shubnikovde Haas effect

KW - α-(BEDT-TTF)KHg(SeCN)

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