Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type etc.

doi:10.1209/0295-5075/82/67002

Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type superconductivity near ferromagnetic instability

G. Xu et al 2008 EPL 82 67002 (5pp) doi: 10.1209/0295-5075/82/67002

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G. Xu¹, W. Ming¹, Y. Yao¹, X. Dai¹, S.-C. Zhang² and Z. Fang¹
¹ Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences Beijing 100190, China
² Department of Physics, Stanford University - Stanford, CA 94305-4045, USA
E-mail: zfang@aphy.iphy.ac.cn

Abstract. By 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.

PACS numbers: 74.70.-b, 74.25.Jb, 74.25.Ha

Print publication: Issue 6 (June 2008)
Received 21 April 2008, accepted for publication 29 April 2008
Published 3 June 2008

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Doping-dependent phase diagram of LaOMAs (M=V–Cu) and electron-type superconductivity near ferromagnetic instability

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