Superconducting properties of MgB2 from first principles

Details Superconducting properties of MgB2 from first principles Superconducting properties of MgB2 from first principles

2004-08-31

arxiv.org/abs/cond-mat/0408688v2

Phys. Rev. Lett. 94, 037004 (2005)

Physics

Condensed Matter

Superconductivity

12 pages, 3 figures, revised version

Scientific paper

10.1103/PhysRevLett.94.037004

Solid MgB$_2$ has rather interesting and technologically important properties, such as a very high superconducting transition temperature. Focusing on this compound, we report the first non-trivial application of a novel density-functional-type theory for superconductors, recently proposed by the authors. Without invoking any adjustable parameters, we obtain the transition temperature, the gaps, and the specific heat of MgB$_2$ in very good agreement with experiment. Moreover, our calculations show how the Coulomb interaction acts differently on s and p states, thereby stabilizing the observed superconducting phase.

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