Superconducting properties of MgB2 from first principles

A. Floris*, A. Sanna, M. Lüders, G. Profeta, N. N. Lathiotakis, M. A.L. Marques, C. Franchini, E. K.U. Gross, A. Continenza, S. Massidda

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

45 Scopus citations

Abstract

The discovery of superconductivity in MgB2, with a rather high transition temperature, has triggered a large number of theoretical and experimental investigations on important issues such as, e.g., the role of gap anisotropy over the Fermi surface (multi-gap superconductivity). We report here the results obtained in this compound using the density functional theory for superconductors, recently proposed by the authors. Without invoking any adjustable parameters, such as μ*, we obtain the transition temperature, the gaps, and the specific heat in very good agreement with experiment. Moreover, our calculations allow for a detailed study of how the phonon-mediated attraction and Coulomb repulsion act differently on σ and π states, thereby stabilizing the observed superconducting phase.

Original languageAmerican English
Pages (from-to)45-53
Number of pages9
JournalPhysica C: Superconductivity and its Applications
Volume456
Issue number1-2
DOIs
StatePublished - 1 Jun 2007
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank Giovanni Ummarino for helpful discussions and for providing results from Eliashberg calculations. This work was supported by the Italian MIUR under the projects PRIN 2006021741 and PON-CyberSar, by the Deutsche Forschungsgemeischaft within the program SPP 1145, by the EXC!TiNG Research and Training Network of the European Union, and by the NANOQUANTA NOE. We also acknowledge financial support by INFM (through a computing grant at Cineca, Bologna, Italy).

Keywords

  • Superconductivity

Fingerprint

Dive into the research topics of 'Superconducting properties of MgB2 from first principles'. Together they form a unique fingerprint.

Cite this