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

2008/03/31 by Gang Xu, Wenmei Ming, W. Ming +7 · 14 citations
Materials Science · Physics and Astronomy · #Electronic and Structural Properties of Oxides #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.str-el #cond-mat.supr-con

paper · pdf · doi:10.1209/0295-5075/82/67002

published as Europhysics Letters, 82, 67002 (2008) · 4 pages, 1 table, 3 figures

openalex publication_date 2008/06/01 · arxiv created 2008/06/04 · arxiv updated 2009/12/01 · openalex created_date 2020/11/23 · openalex updated_date 2026/07/30

Abstract

By first-principles calculations, we present a doping-dependent phase diagram of the LaO M As ( 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.

Citations

• Generalized Gradient Approximation Made Simple
• Soft self-consistent pseudopotentials in a generalized eigenvalue formalism

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