Doping-dependent Phase Diagram and Electron-type Superconductivity in LaO{\it M}As ({\it M}=V--Cu)

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  • 9 March 2008
Abstract
Based on first-principles calculations, we present a doping-dependent phase diagram of LaO{\it M}As ({\it M}=V--Cu) family. It is characterized as antiferromagnetic (AF) semiconductor around LaOMnAs side and ferromagnetic metal around LaOCoAs. Both LaOFeAs and LaONiAs, where superconductivity were discovered, are non-magnetic metals in its normal state but locate at the borderline of magnetic phases. Extensive Fermi surface analysis suggests that the observed superconductivity is of electron-type in its origin.

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