Effects of Disorder in Mg_{1-x}Ta_{x}B_2 Alloys using Coherent-Potential Approximation

Details Effects of Disorder in Mg_{1-x}Ta_{x}B_2 Alloys using Coherent-Potential Approximation Effects of Disorder in Mg_{1-x}Ta_{x}B_2 Alloys using Coherent-Potential Approximation

2002-01-08

arxiv.org/abs/cond-mat/0201094v2

Solid State Commun. 121, 467-470 (2002).

Physics

Condensed Matter

Superconductivity

v.2: References rearranged, Accepted for publication in Solid State Communications

Scientific paper

10.1016/S0038-1098(02)00048-0

Using Korringa-Kohn-Rostoker coherent-potential approximation in the atomic-sphere approximation (KKR-ASA CPA) method for taking into account the effects of disorder, Gaspari-Gyorffy formalism for calculating the electron-phonon coupling constant $\lambda$, and Allen-Dynes equation for calculating T_c, we have studied the variation of T_c in Mg_{1-x}Ta_{x}B_2 alloys as a function of Ta) concentration. Our results show that the T_c decreases with the addition of Ta for upto 40 at% and remains essentially zero from 60 at% to 80 at% of Ta. We also find TaB_2 to be superconducting, albeit at a lower temperature. Our analysis shows that the variation in T_c in Mg_{1-x}Ta_{x}B_2 is mostly dictated by the changes in the B p density of states with the addition of Ta.

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