Acoustic de Haas-van Alphen Effect in Organic Superconductor α-(BEDT-TTF)2NH4Hg(SCN)4

Hiroshi Matsui; Masanori Yamaguchi; Satoshi Endo; Tomoaki Inuzuka; Hiroshi Uozaki; Naoki Toyota

doi:10.1143/JPSJ.67.2586

Acoustic de Haas-van Alphen Effect in Organic Superconductor α-(BEDT-TTF)₂NH₄Hg(SCN)₄

Hiroshi Matsui, Masanori Yamaguchi, Satoshi Endo, Tomoaki Inuzuka, Hiroshi Uozaki, Naoki Toyota

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

4 Citations (Scopus)

Abstract

Longitudinal sound velocity measurements propagating along the interlayer direction have been performed at 53.4 MHz by a phase comparison method on a quasi-two-dimensional (Q2D) organic superconductor α-(BEDT-TTF)₂NH₄Hg(SCN)₄ with T_c = 1 K. Temperature dependence of the sound velocity shows anomalies around 20 K and 60 K. The acoustic de Haas-van Alphen (dHvA) effects are observed below 1.8 K for the first time in these organic metals. The quantum oscillations originate from the α-Fermi surface (FS) of a weakly warped cylindrical shape. According to the theoretical formulations by Kataoka and Goto for an acoustic dHvA effect, the absolute area coefficient |Λ_L| is estimated to be about 3.5. The multiband term Λ^m_L is concluded to dominantly contribute to |Λ_L|.

Original language	English
Pages (from-to)	2586-2589
Number of pages	4
Journal	journal of the physical society of japan
Volume	67
Issue number	8
DOIs	https://doi.org/10.1143/JPSJ.67.2586
Publication status	Published - 1998 Aug
Externally published	Yes

Keywords

Acoustic de haas-van alphen effect
Electron-lattice coupling
Two-dimensional system
Ultrasound
α-(BEDT-TTF)NHHg(SCN)

ASJC Scopus subject areas

Physics and Astronomy(all)

Access to Document

10.1143/JPSJ.67.2586

Cite this

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title = "Acoustic de Haas-van Alphen Effect in Organic Superconductor α-(BEDT-TTF)2NH4Hg(SCN)4",

abstract = "Longitudinal sound velocity measurements propagating along the interlayer direction have been performed at 53.4 MHz by a phase comparison method on a quasi-two-dimensional (Q2D) organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4 with Tc = 1 K. Temperature dependence of the sound velocity shows anomalies around 20 K and 60 K. The acoustic de Haas-van Alphen (dHvA) effects are observed below 1.8 K for the first time in these organic metals. The quantum oscillations originate from the α-Fermi surface (FS) of a weakly warped cylindrical shape. According to the theoretical formulations by Kataoka and Goto for an acoustic dHvA effect, the absolute area coefficient |ΛL| is estimated to be about 3.5. The multiband term ΛmL is concluded to dominantly contribute to |ΛL|.",

keywords = "Acoustic de haas-van alphen effect, Electron-lattice coupling, Two-dimensional system, Ultrasound, α-(BEDT-TTF)NHHg(SCN)",

author = "Hiroshi Matsui and Masanori Yamaguchi and Satoshi Endo and Tomoaki Inuzuka and Hiroshi Uozaki and Naoki Toyota",

year = "1998",

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doi = "10.1143/JPSJ.67.2586",

language = "English",

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T1 - Acoustic de Haas-van Alphen Effect in Organic Superconductor α-(BEDT-TTF)2NH4Hg(SCN)4

AU - Matsui, Hiroshi

AU - Yamaguchi, Masanori

AU - Endo, Satoshi

AU - Inuzuka, Tomoaki

AU - Uozaki, Hiroshi

AU - Toyota, Naoki

PY - 1998/8

Y1 - 1998/8

N2 - Longitudinal sound velocity measurements propagating along the interlayer direction have been performed at 53.4 MHz by a phase comparison method on a quasi-two-dimensional (Q2D) organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4 with Tc = 1 K. Temperature dependence of the sound velocity shows anomalies around 20 K and 60 K. The acoustic de Haas-van Alphen (dHvA) effects are observed below 1.8 K for the first time in these organic metals. The quantum oscillations originate from the α-Fermi surface (FS) of a weakly warped cylindrical shape. According to the theoretical formulations by Kataoka and Goto for an acoustic dHvA effect, the absolute area coefficient |ΛL| is estimated to be about 3.5. The multiband term ΛmL is concluded to dominantly contribute to |ΛL|.

AB - Longitudinal sound velocity measurements propagating along the interlayer direction have been performed at 53.4 MHz by a phase comparison method on a quasi-two-dimensional (Q2D) organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4 with Tc = 1 K. Temperature dependence of the sound velocity shows anomalies around 20 K and 60 K. The acoustic de Haas-van Alphen (dHvA) effects are observed below 1.8 K for the first time in these organic metals. The quantum oscillations originate from the α-Fermi surface (FS) of a weakly warped cylindrical shape. According to the theoretical formulations by Kataoka and Goto for an acoustic dHvA effect, the absolute area coefficient |ΛL| is estimated to be about 3.5. The multiband term ΛmL is concluded to dominantly contribute to |ΛL|.

KW - Acoustic de haas-van alphen effect

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KW - α-(BEDT-TTF)NHHg(SCN)

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