Calculation of the specific heat of optimally K-doped BaFe${}_2$As${}_2$

Abstract

The calculated specific heat of optimally K-doped BaFe${}_2$As${}_2$ in density functional theory is about five times smaller than that found in the experiment. We report that by adjusting the potential on the iron atom to be slightly more repulsive for electrons improves the calculated heat capacity as well as the structural, magnetic, and electronic properties of Ba${}_{0.6}$K${}_{0.4}$Fe${}_2$As${}_2$. Applying the same correction to the antiferromagnetic state, we find that the electron-phonon coupling is strongly enhanced.

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Cited by in corpus (1)

• The influence of antiferromagnetism, soft out-of plane phonons and heavy electrons on the superconducting pairing mechanism of Ba1-xKxFe2As2