Indexed by: Journal paper

First Author: 徐刚

Correspondence Author: 方忠

Co-author: Gang Xu, Wenmei Ming, Yugui Yao, Xi Dai, S-C Zhang, Zhong Fang

Journal: Europhysics Letters

Included Journals: SCI、EI

Discipline: Science

First-Level Discipline: Physics

Document Type: J

Volume: 82

Issue: 6

Page Number: 67002

Date of Publication: 2008-06-03

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.