Itinerant nature of magnetism in iron pnictides: A first-principles study

Yu Zhong Zhang, Ingo Opahle, Harald Olaf Jeschke, Roser Valentí

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Within the framework of density-functional theory, we investigate the nature of magnetism in various families of Fe-based superconductors. (i) We show that magnetization of stripe-type antiferromagnetic order always becomes stronger when As is substituted by Sb in LaOFeAs, BaFe2 As 2, and LiFeAs. By calculating Pauli susceptibilities, we attribute the magnetization increase obtained after replacing As by Sb to the enhancement of an instability at (π,π). This points to a strong connection between Fermi-surface nesting and magnetism, which supports the theory of the itinerant nature of magnetism in various families of Fe-based superconductors. (ii) We find that within the family LaOFePn (Pn=P, As, Sb, and Bi), the absence of an antiferromagnetic phase in LaOFeP and its presence in LaOFeAs can be attributed to the competition of instabilities in the Pauli susceptibility at (π,π) and (0,0), which further strengthens the close relation between Fermi-surface nesting and experimentally observed magnetization. (iii) Finally, based on our relaxed structures and Pauli susceptibility results, we predict that LaOFeSb upon doping or application of pressure should be a candidate for a superconductor with the highest transition temperature among the hypothetical compounds LaOFeSb, LaOFeBi, ScOFeP, and ScOFeAs while the parent compounds LaOFeSb and LaOFeBi should show, at ambient pressure, a stripe-type antiferromagnetic metallic state.

Original languageEnglish
Article number094505
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume81
Issue number9
DOIs
Publication statusPublished - Mar 5 2010
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Itinerant nature of magnetism in iron pnictides: A first-principles study'. Together they form a unique fingerprint.

  • Cite this