Volume 104, Number 3, November 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||06 December 2013|
Fermiological interpretation of FeTe1−xSex thin crystal by quantum conductance oscillation
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
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.
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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