On the low-temperature enhancement of the hall coefficient in an organic superconductor κ-(BEDT-TTF)2Cu(SCN)2; Two-band approach

Takahiko Sasaki; Naoki Toyota

doi:10.1016/0379-6779(93)90414-R

On the low-temperature enhancement of the hall coefficient in an organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂; Two-band approach

Takahiko Sasaki, Naoki Toyota

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

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

11 Citations (Scopus)

Abstract

The energy gap E_g at the zone boundary between the closed cylindrical and opened planar Fermi surfaces is found to be (54±10)K and the Fermi energy E_F is (740±100)K in the organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂ by the analysis of the magnetic breakdown effect on the Shubnikov-de Haas oscillations in high magnetic fields. We propose a two-band model with the small E_g and E_F in order to explain the puzzling enhancement of the Hall coefficient below 50-70K (which is close to E_g) observed by other groups. This model is in good agreement with the experimental results of the enhancement around T≅E_g. The non-linear magnetic field dependence of the Hall resistance which we have at high-fields (>12T) and low-temperature at 4.2K (≪E_g) is consistent with our model.

Original language	English
Pages (from-to)	2303-2308
Number of pages	6
Journal	Synthetic Metals
Volume	56
Issue number	1
DOIs	https://doi.org/10.1016/0379-6779(93)90414-R
Publication status	Published - 1993 Mar 29

ASJC Scopus subject areas

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

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title = "On the low-temperature enhancement of the hall coefficient in an organic superconductor κ-(BEDT-TTF)2Cu(SCN)2; Two-band approach",

abstract = "The energy gap Eg at the zone boundary between the closed cylindrical and opened planar Fermi surfaces is found to be (54±10)K and the Fermi energy EF is (740±100)K in the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 by the analysis of the magnetic breakdown effect on the Shubnikov-de Haas oscillations in high magnetic fields. We propose a two-band model with the small Eg and EF in order to explain the puzzling enhancement of the Hall coefficient below 50-70K (which is close to Eg) observed by other groups. This model is in good agreement with the experimental results of the enhancement around T≅Eg. The non-linear magnetic field dependence of the Hall resistance which we have at high-fields (>12T) and low-temperature at 4.2K (≪Eg) is consistent with our model.",

author = "Takahiko Sasaki and Naoki Toyota",

note = "Funding Information: ACKNOWLEDGEMENTS The authors would like to thank Profi T. Fukase and Prof. Y. Nakagawa for their encouragements. The present work has been carried out at High Field Laboratory, IMR, Tohoku Univ. and partly supported by Grant-in-Aid for Scientific Research from Ministry of Education, Science and Culture of Japan.",

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doi = "10.1016/0379-6779(93)90414-R",

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T1 - On the low-temperature enhancement of the hall coefficient in an organic superconductor κ-(BEDT-TTF)2Cu(SCN)2; Two-band approach

AU - Sasaki, Takahiko

AU - Toyota, Naoki

N1 - Funding Information: ACKNOWLEDGEMENTS The authors would like to thank Profi T. Fukase and Prof. Y. Nakagawa for their encouragements. The present work has been carried out at High Field Laboratory, IMR, Tohoku Univ. and partly supported by Grant-in-Aid for Scientific Research from Ministry of Education, Science and Culture of Japan.

PY - 1993/3/29

Y1 - 1993/3/29

N2 - The energy gap Eg at the zone boundary between the closed cylindrical and opened planar Fermi surfaces is found to be (54±10)K and the Fermi energy EF is (740±100)K in the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 by the analysis of the magnetic breakdown effect on the Shubnikov-de Haas oscillations in high magnetic fields. We propose a two-band model with the small Eg and EF in order to explain the puzzling enhancement of the Hall coefficient below 50-70K (which is close to Eg) observed by other groups. This model is in good agreement with the experimental results of the enhancement around T≅Eg. The non-linear magnetic field dependence of the Hall resistance which we have at high-fields (>12T) and low-temperature at 4.2K (≪Eg) is consistent with our model.

AB - The energy gap Eg at the zone boundary between the closed cylindrical and opened planar Fermi surfaces is found to be (54±10)K and the Fermi energy EF is (740±100)K in the organic superconductor κ-(BEDT-TTF)2Cu(SCN)2 by the analysis of the magnetic breakdown effect on the Shubnikov-de Haas oscillations in high magnetic fields. We propose a two-band model with the small Eg and EF in order to explain the puzzling enhancement of the Hall coefficient below 50-70K (which is close to Eg) observed by other groups. This model is in good agreement with the experimental results of the enhancement around T≅Eg. The non-linear magnetic field dependence of the Hall resistance which we have at high-fields (>12T) and low-temperature at 4.2K (≪Eg) is consistent with our model.

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On the low-temperature enhancement of the hall coefficient in an organic superconductor κ-(BEDT-TTF)₂Cu(SCN)₂; Two-band approach

Abstract

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