Comment on "Doping Driven ($π,0$) Nesting and Magnetic Properties of Fe$_{1+x}$Te Superconductors" [Phys. Rev. Lett. 103, 067001 (2009)]

Details Comment on "Doping Driven ($π,0$) Nesting and Magnetic Properties of Fe$_{1+x}$Te Superconductors" [Phys. Rev. Lett. 103, 067001 (2009)] Comment on "Doping Driven ($π,0$) Nesting and Magnetic Properties of Fe$_{1+x}$Te Superconductors" [Phys. Rev. Lett. 103, 067001 (2009)]

2010-03-05

arxiv.org/abs/1003.1186v1

Phys. Rev. Lett. 104, 099701 (2010)

Physics

Condensed Matter

Superconductivity

1 page, 1 fig

Scientific paper

In this Comment, using Korringa-Kohn-Rostoker coherent-potential approximation method in the atomic-sphere approximation (KKR-ASA CPA) to describe the effects of disorder due to excess Fe in FeTe alloys, we show that (i) the rigid-band approximation is inadequate to describe the effects of disorder and its application leads to an incorrect description of the underlying physics, (ii) the rigid-band energy shift of ~0.76 eV for going from FeTe to Fe_{1.068}Te (or Fe_{1.063}Te), as obtained by Han and Savrasov (Phys. Rev. Lett. 103, 067001(2009)), is inconsistent with our FP-LMTO as well as the KKR-ASA results, and thus the FS of Fe_{1.063}Te shown in Fig. 3(b) of their paper is not correct.

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