2,395 research outputs found
From E_{2g} to other modes : Effects of pressure on electron-phonon interaction in MgB_2
We study the effects of pressure on the electron-phonon interaction in MgB_2
using density-functional-based methods. Our results show that the
superconductivity in MgB_2 vanishes by 100 GPa, and then reappears at higher
pressures. In particular, we find a superconducting transition temperature T_c
\~ 2 K for mu*=0.1 at a pressure of 137 GPa.Comment: 4 pages, 6 figures; one figure and discussion on phonon softening
adde
Comment on "Doping Driven () Nesting and Magnetic Properties of FeTe Superconductors" [Phys. Rev. Lett. 103, 067001 (2009)]
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.Comment: 1 page, 1 fi
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