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

被引：210

作者：

Xu, G. ^{[1
]}

Ming, W. ^{[1
]}

Yao, Y. ^{[1
]}

Dai, X. ^{[1
]}

Zhang, S. -C. ^{[2
]}

Fang, Z. ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

[2] Stanford Univ, Dept Phys, Stanford, CA 94305 USA

来源：

EPL | 2008年 / 82卷 / 06期

关键词：

D O I：

10.1209/0295-5075/82/67002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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. Copyright (C) EPLA, 2008.

引用

页数：5

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