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Specific heat of MgB2 in a one- and a two-band model from first-principles calculations

MPS-Authors
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Golubov,  A. A.
Former Scientific Facilities, 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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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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Jepsen,  O.
Former Departments, Max Planck Institute for Solid State Research, Max Planck Society;

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Kong,  Y.
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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Gibson,  B. J.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Ahn,  K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Kremer,  R. K.
Former Scientific Facilities, Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Golubov, A. A., Kortus, J., Dolgov, O. V., Jepsen, O., Kong, Y., Andersen, O. K., et al. (2002). Specific heat of MgB2 in a one- and a two-band model from first-principles calculations. Journal of Physics: Condensed Matter, 14(6), 1353-1360.


Cite as: https://hdl.handle.net/21.11116/0000-000E-F1AD-F
Abstract
The heat capacity anomaly at the transition to
superconductivity of the layered superconductor MgB2 is
compared to first-principles calculations with the Coulomb
repulsion, mu*, as the only parameter which is fixed to give
the measured T-c. We solve the Eliashberg equations for both an
isotropic one-band model and a two-band model with different
superconducting gaps on the pi-band and sigma-band Fermi
surfaces. The agreement with experiments is considerably better
for the two-band model than for the one-band model.