Specific heat of MgB2 in a one- and a two-band model from first-principles calculations
By A. Golubov, Jens Kortus, O. Dolgov, O. Jepsen, Yong Kong, O. K. Andersen, B. Gibson, K. Ahn, R. K. Kremer. 2001
242 citations recorded by the source corpus.
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.
Subfields: Condensed Matter Physics, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/2960657459d1bf5a145eb339eadaac84db4eb503
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In Condensed Matter Physics
In Electronic, Optical and Magnetic Materials
Citations in the corpus
- Very high upper critical fields in MgB2 produced by selective tuning of impurity scattering (2003, methodology): “First, from the fit to the Hc2(T ) curve, one can evaluate the values of Dσ and Dπ ,u sing th ec oupling constants λmn and the partial densities of states Nσ and Nπ from ab initio calculations [16, 17, 38 ] as input parameters in equation (2).”
- Two-band superconductor magnesium diboride (2008, methodology): “The electron–phonon coupling constant matrix elements have been calculated by various groups: λσσ = 0.96, λππ = 0.29, λσπ = 0.23, λπσ = 0.17 and the total λ = 0.77 by Liu and coworkers [94, 102]; λσσ = 1.017, λππ = 0.448, λσπ = 0.213, λπσ = 0.155 and λ = 0.87 by Golubov et al [99]; λσσ = 0.78, λππ =”
- Iron-based superconductors at high magnetic fields (2011, methodology): “While all attempts to raise Tc of MgB2 by atomic substitutions have not succeeded, extensive investigations of the substitutional chemistry of ferropnictides eventually revealed numerous new Fe-based superconductors (FBSs) with higher Tc.”