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

Alexandre Avraamovitch Golubov; J. Kortus; O.V. Dolgov; O. Jepsen; Y. Kong; O.K. Andersen; B.J. Gibson; K. Ahn; R.K. Kremer

doi:10.1088/0953-8984/14/6/320

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

Alexandre Avraamovitch Golubov, J. Kortus, O.V. Dolgov, O. Jepsen, Y. Kong, O.K. Andersen, B.J. Gibson, K. Ahn, R.K. Kremer

Faculty of Science and Technology

Research output: Contribution to journal › Article › Academic › peer-review

318 Citations (Scopus)

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, µ*, as the only parameter which is fixed to give the measured Tc. We solve the Eliashberg equations for both an isotropic one-band model and a two-band model with different superconducting gaps on the π-band and σ-band Fermi surfaces. The agreement with experiments is considerably better for the two-band model than for the one-band model.

Original language	Undefined
Pages (from-to)	1353-1360
Number of pages	8
Journal	Journal of physics: Condensed matter
Volume	14
Issue number	6
DOIs	https://doi.org/10.1088/0953-8984/14/6/320
Publication status	Published - 2002

Keywords

METIS-206850
IR-97890

Access to Document

10.1088/0953-8984/14/6/320

Cite this

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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, µ*, as the only parameter which is fixed to give the measured Tc. We solve the Eliashberg equations for both an isotropic one-band model and a two-band model with different superconducting gaps on the π-band and σ-band Fermi surfaces. The agreement with experiments is considerably better for the two-band model than for the one-band model.",

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T1 - Specific heat of MgB2 in a one- and two-band model from first-principels calculations

AU - Golubov, Alexandre Avraamovitch

AU - Kortus, J.

AU - Dolgov, O.V.

AU - Jepsen, O.

AU - Kong, Y.

AU - Andersen, O.K.

AU - Gibson, B.J.

AU - Ahn, K.

AU - Kremer, R.K.

PY - 2002

Y1 - 2002

N2 - The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB2 is compared to first-principles calculations with the Coulomb repulsion, µ*, as the only parameter which is fixed to give the measured Tc. We solve the Eliashberg equations for both an isotropic one-band model and a two-band model with different superconducting gaps on the π-band and σ-band Fermi surfaces. The agreement with experiments is considerably better for the two-band model than for the one-band model.

AB - The heat capacity anomaly at the transition to superconductivity of the layered superconductor MgB2 is compared to first-principles calculations with the Coulomb repulsion, µ*, as the only parameter which is fixed to give the measured Tc. We solve the Eliashberg equations for both an isotropic one-band model and a two-band model with different superconducting gaps on the π-band and σ-band Fermi surfaces. The agreement with experiments is considerably better for the two-band model than for the one-band model.

KW - METIS-206850

KW - IR-97890

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DO - 10.1088/0953-8984/14/6/320

M3 - Article

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SP - 1353

EP - 1360

JO - Journal of physics: Condensed matter

JF - Journal of physics: Condensed matter

SN - 0953-8984

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