Angle-dependent magnetoresistance oscillations and charge density wave in the organic conductor α-(BEDT-TTF)2KHg(SCN)4

Kazuhito Uchida; Ryu Yamaguchi; Takako Konoike; Toshihito Osada; Woun Kang

doi:10.7566/JPSJ.82.043714

Angle-dependent magnetoresistance oscillations and charge density wave in the organic conductor α-(BEDT-TTF)₂KHg(SCN)₄

Kazuhito Uchida, Ryu Yamaguchi, Takako Konoike, Toshihito Osada, Woun Kang

Department of Physics

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

5 Scopus citations

Abstract

We have performed full stereographic study on angle-dependent magnetoresistance oscillations (AMROs) in the layered organic conductor, α-(BEDT-TTF)₂KHg(SCN)₄, which shows a charge density wave (CDW) transition at T_c. AMROs originating from normal Fermi surfaces (FSs) and reconstructed ones appear above T_c and much below T_c, respectively. We have observed mixing of these AMROs just below T_c in the CDW phase. Observed features strongly suggest magnetic breakdown in reconstructed FSs. In fact, they are reproduced by a quantum-mechanical model on AMROs under weak periodic potential. The possibility of the unconventional CDW, in which the CDW gap has nodal points on the Fermi surface, is excluded in this compound.

Original language	English
Article number	043714
Journal	Journal of the Physical Society of Japan
Volume	82
Issue number	4
DOIs	https://doi.org/10.7566/JPSJ.82.043714
State	Published - Apr 2013

Keywords

Angle-dependent magnetoresistance oscillation
BEDT-TTF
Magnetic breakdown
Organic conductor
Unconventional charge density wave

Access to Document

10.7566/JPSJ.82.043714

Cite this

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title = "Angle-dependent magnetoresistance oscillations and charge density wave in the organic conductor α-(BEDT-TTF)2KHg(SCN)4",

abstract = "We have performed full stereographic study on angle-dependent magnetoresistance oscillations (AMROs) in the layered organic conductor, α-(BEDT-TTF)2KHg(SCN)4, which shows a charge density wave (CDW) transition at Tc. AMROs originating from normal Fermi surfaces (FSs) and reconstructed ones appear above Tc and much below Tc, respectively. We have observed mixing of these AMROs just below Tc in the CDW phase. Observed features strongly suggest magnetic breakdown in reconstructed FSs. In fact, they are reproduced by a quantum-mechanical model on AMROs under weak periodic potential. The possibility of the unconventional CDW, in which the CDW gap has nodal points on the Fermi surface, is excluded in this compound.",

keywords = "Angle-dependent magnetoresistance oscillation, BEDT-TTF, Magnetic breakdown, Organic conductor, Unconventional charge density wave",

author = "Kazuhito Uchida and Ryu Yamaguchi and Takako Konoike and Toshihito Osada and Woun Kang",

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T1 - Angle-dependent magnetoresistance oscillations and charge density wave in the organic conductor α-(BEDT-TTF)2KHg(SCN)4

AU - Uchida, Kazuhito

AU - Yamaguchi, Ryu

AU - Konoike, Takako

AU - Osada, Toshihito

AU - Kang, Woun

PY - 2013/4

Y1 - 2013/4

N2 - We have performed full stereographic study on angle-dependent magnetoresistance oscillations (AMROs) in the layered organic conductor, α-(BEDT-TTF)2KHg(SCN)4, which shows a charge density wave (CDW) transition at Tc. AMROs originating from normal Fermi surfaces (FSs) and reconstructed ones appear above Tc and much below Tc, respectively. We have observed mixing of these AMROs just below Tc in the CDW phase. Observed features strongly suggest magnetic breakdown in reconstructed FSs. In fact, they are reproduced by a quantum-mechanical model on AMROs under weak periodic potential. The possibility of the unconventional CDW, in which the CDW gap has nodal points on the Fermi surface, is excluded in this compound.

AB - We have performed full stereographic study on angle-dependent magnetoresistance oscillations (AMROs) in the layered organic conductor, α-(BEDT-TTF)2KHg(SCN)4, which shows a charge density wave (CDW) transition at Tc. AMROs originating from normal Fermi surfaces (FSs) and reconstructed ones appear above Tc and much below Tc, respectively. We have observed mixing of these AMROs just below Tc in the CDW phase. Observed features strongly suggest magnetic breakdown in reconstructed FSs. In fact, they are reproduced by a quantum-mechanical model on AMROs under weak periodic potential. The possibility of the unconventional CDW, in which the CDW gap has nodal points on the Fermi surface, is excluded in this compound.

KW - Angle-dependent magnetoresistance oscillation

KW - BEDT-TTF

KW - Magnetic breakdown

KW - Organic conductor

KW - Unconventional charge density wave

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