G. Xu et al 2008 EPL 82 67002 doi:10.1209/0295-5075/82/67002
G. Xu1, W. Ming1, Y. Yao1, X. Dai1, S.-C. Zhang2 and Z. Fang1
Show affiliationsBy first-principles calculations, we present a doping-dependent phase diagram of the LaOMAs (M=V–Cu) family. It is characterized as a antiferromagnetic semiconductor around the LaOMnAs side and as a ferromagnetic metal around LaOCoAs. Both LaOFeAs and LaONiAs, where superconductivity were discovered, are located at the borderline of magnetic phases. An extensive Fermi surface analysis suggests that the observed superconductivity is of electron type in its origin. We discuss possible pairing mechanisms in the context of competing ferromagnetic phases found in this work and the ferromagnetic spin fluctuations.
Issue 6 (June 2008)
Received 21 April 2008, accepted for publication 29 April 2008
Published 3 June 2008
G. Xu et al 2008 EPL 82 67002
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