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We have successfully observed quantum oscillation (QO) for FeTe_{1-x}Se_{x}.QO measurements were performed using non-superconducting and superconductingthin crystals of FeTe_{0.65}Se_{0.35} fabricated by the scotch-tape method. Weshow that the Fermi surfaces (FS) of the non-superconducting crystal are ingood agreement with the rigid band shift model based on electron doping byexcess Fe while that of the superconducting crystal is in good agreement withthe calculated FS with no shift. From the FS comparison of both crystals, wedemonstrate the change of the cross-sectional area of the FS, suggesting thatthe suppression of the FS nesting with the vector Q_{s} = (\pi, \pi) due toexcess Fe results in the disappearance of the superconductivity.

europhysics letters

Fermiological Interpretation of Superconductivity/Non-superconductivity  of FeTe_{1-x}Se_{x} Thin Crystal Determined by Quantum Oscillation  Measurement