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

All issues

Volume 104 / No 3 (November 2013)

EPL, 104 3 (2013) 37010

Abstract

Issue		EPL Volume 104, Number 3, November 2013


Article Number		37010
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/104/37010
Published online		06 December 2013

EPL, 104 (2013) 37010

Fermiological interpretation of FeTe_1−xSe_x thin crystal by quantum conductance oscillation

H. Okazaki¹, T. Yamaguchi¹, T. Watanabe¹^,2, K. Deguchi¹^,2, S. Demura¹^,2, S. J. Denholme¹, T. Ozaki¹, Y. Mizuguchi³, H. Takeya¹, T. Oguchi⁴ and Y. Takano¹

¹ National Institute for Materials Science - 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047, Japan
² Graduate School of Pure and Applied Sciences, University of Tsukuba - 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8577, Japan
³ Department of Electrical and Electronic Engineering, Tokyo Metropolitan University 1-1 Minami-osawa, Hachioji 192-0397, Japan
⁴ Institute of Scientific and Industrial Research, Osaka University - 8-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan

Received: 22 August 2013
Accepted: 12 November 2013

Abstract

We have successfully observed quantum oscillations in the magnetic-field dependence of resistivity in FeTe_1−xSe_x. Quantum oscillation measurements were performed using non-superconducting and superconducting thin crystals of FeTe_0.65Se_0.35 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 $\bm{Q}_{\text{s}} = (\pi , \pi)$ due to excess Fe leads to the disappearance of superconductivity.

PACS: 71.18.+y – Fermi surface: calculations and measurements; effective mass, g factor / 74.70.Xa – Pnictides and chalcogenides

© EPLA, 2013

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