Electronic band structure, phonon spectrum, and elastic properties of LaOFeAs

TL;DR

This paper presents ab-initio calculations of LaOFeAs's electronic, phononic, and elastic properties, providing insights into its potential for high-temperature superconductivity upon doping.

Contribution

It offers the first comprehensive theoretical analysis of LaOFeAs's electronic, vibrational, and elastic properties, linking these to superconductivity mechanisms.

Findings

Electronic density of states characterized for undoped LaOFeAs.

Phonon dispersion and density of states calculated.

Elastic constants estimated for different electronic states.

Abstract

We present results of ab-initio calculations of the electronic band structure, lattice dynamical properties, and elastic constants of LaOFeAs, the parent compound of the recently discovered superconducting iron-oxypnictide (LaO1-xFxFeAs). The total and partial electronic density of states (EDOS) of the undoped LaOFeAs (in the insulating or metallic state) are extracted from the electronic band structure. The phonon dispersion and the phonon density of states (PDOS) are also studied. Possible implications of the band structure, EDOS, and PDOS of LaOFeAs on the eventual appearance of high-Tc superconductivity upon carrier doping are discussed. The values of various independent elastic constants for both insulating and metallic states are estimated and discussed.