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Comment on "First-principles calculation of the superconducting transition in MgB2 within the anisotropic Eliashberg formalism"

MPS-Authors
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Mazin,  I. I.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Andersen,  O. K.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Jepsen,  O.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Golubov,  A. A.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Dolgov,  O. V.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;
Department Solid State Spectroscopy (Bernhard Keimer), Max Planck Institute for Solid State Research, Max Planck Society;
Department Nanoscale Science (Klaus Kern), Max Planck Institute for Solid State Research, Max Planck Society;

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Kortus,  J.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Mazin, I. I., Andersen, O. K., Jepsen, O., Golubov, A. A., Dolgov, O. V., & Kortus, J. (2004). Comment on "First-principles calculation of the superconducting transition in MgB2 within the anisotropic Eliashberg formalism". Physical Review B, 69(5): 056501.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FEE8-F
Abstract
Choi [Phys. Rev. B 66, 020513 (2002)] recently presented
first-principles calculations of the electron-phonon coupling and
superconductivity in MgB2, emphasizing the importance of anisotropy and
anharmonicity. We point out that (1) variation of the superconducting
gap inside the sigma or the pi bands can hardly be observed in real
samples, and (2) taking the anisotropy of the Coulomb repulsion into
account influences the size of the small gap, Delta(pi).