Fermiological interpretation of FeTe1-xSex thin crystal by quantum conductance oscillation

H. Okazaki; T. Yamaguchi; T. Watanabe; K. Deguchi; S. Demura; S. J. Denholme; T. Ozaki; Y. Mizuguchi; H. Takeya; T. Oguchi; Y. Takano

doi:10.1209/0295-5075/104/37010

Fermiological interpretation of FeTe_1-xSex thin crystal by quantum conductance oscillation

H. Okazaki, T. Yamaguchi, T. Watanabe, K. Deguchi, S. Demura, S. J. Denholme, T. Ozaki, Y. Mizuguchi, H. Takeya, T. Oguchi, Y. Takano

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

4 Citations (Scopus)

Abstract

We have successfully observed quantum oscillations in the magnetic-field dependence of resistivity in FeTe_1-xSex. Quantum oscillation measurements were performed using non-superconducting and superconducting thin crystals of FeTe_0.65Se0.35 cleaved from a bulk single crystal by mechanical exfoliation. We show that the Fermi surface (FS) of the non-superconducting crystals is in good agreement with the rigid band shift model based on electron doping by excess Fe, while that of the superconducting crystal is in good agreement with the calculated FS with no shift. From the comparison of the FS for both crystals, we determined the change of the cross-sectional area of the FS, suggesting that the suppression of the FS nesting with the vector due to excess Fe leads to the disappearance of superconductivity.

Original language	English
Article number	37010
Journal	EPL
Volume	104
Issue number	3
DOIs	https://doi.org/10.1209/0295-5075/104/37010
Publication status	Published - Nov 2013
Externally published	Yes

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title = "Fermiological interpretation of FeTe1-xSex thin crystal by quantum conductance oscillation",

abstract = "We have successfully observed quantum oscillations in the magnetic-field dependence of resistivity in FeTe1-xSex. Quantum oscillation measurements were performed using non-superconducting and superconducting thin crystals of FeTe0.65Se0.35 cleaved from a bulk single crystal by mechanical exfoliation. We show that the Fermi surface (FS) of the non-superconducting crystals is in good agreement with the rigid band shift model based on electron doping by excess Fe, while that of the superconducting crystal is in good agreement with the calculated FS with no shift. From the comparison of the FS for both crystals, we determined the change of the cross-sectional area of the FS, suggesting that the suppression of the FS nesting with the vector due to excess Fe leads to the disappearance of superconductivity.",

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language = "English",

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T1 - Fermiological interpretation of FeTe1-xSex thin crystal by quantum conductance oscillation

AU - Okazaki, H.

AU - Yamaguchi, T.

AU - Watanabe, T.

AU - Deguchi, K.

AU - Demura, S.

AU - Denholme, S. J.

AU - Ozaki, T.

AU - Mizuguchi, Y.

AU - Takeya, H.

AU - Oguchi, T.

AU - Takano, Y.

PY - 2013/11

Y1 - 2013/11

N2 - We have successfully observed quantum oscillations in the magnetic-field dependence of resistivity in FeTe1-xSex. Quantum oscillation measurements were performed using non-superconducting and superconducting thin crystals of FeTe0.65Se0.35 cleaved from a bulk single crystal by mechanical exfoliation. We show that the Fermi surface (FS) of the non-superconducting crystals is in good agreement with the rigid band shift model based on electron doping by excess Fe, while that of the superconducting crystal is in good agreement with the calculated FS with no shift. From the comparison of the FS for both crystals, we determined the change of the cross-sectional area of the FS, suggesting that the suppression of the FS nesting with the vector due to excess Fe leads to the disappearance of superconductivity.

AB - We have successfully observed quantum oscillations in the magnetic-field dependence of resistivity in FeTe1-xSex. Quantum oscillation measurements were performed using non-superconducting and superconducting thin crystals of FeTe0.65Se0.35 cleaved from a bulk single crystal by mechanical exfoliation. We show that the Fermi surface (FS) of the non-superconducting crystals is in good agreement with the rigid band shift model based on electron doping by excess Fe, while that of the superconducting crystal is in good agreement with the calculated FS with no shift. From the comparison of the FS for both crystals, we determined the change of the cross-sectional area of the FS, suggesting that the suppression of the FS nesting with the vector due to excess Fe leads to the disappearance of superconductivity.

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Fermiological interpretation of FeTe_1-xSex thin crystal by quantum conductance oscillation

Abstract

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