Orbital-selective magnetism in FeAs-based superconductors

Details Orbital-selective magnetism in FeAs-based superconductors Orbital-selective magnetism in FeAs-based superconductors

2010-12-10

arxiv.org/abs/1012.2224v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

We report first-principles studies of lanthanide-series (Ln) iron oxypnictides LnFeAsO (Ln=La, Ce, Pr, Nd, Sm, and Gd) which show two competing orbital-selective magnetic phases in small-Fe-moment regime: an in-plane dxy magnetic phase, itinerantly driven by orbital selection of Fermi-surface nesting, and an out-of-plane dyz magnetic phase, driven by local interactions. The Fe magnetic moments in the two phases show different coupling strengths to Fermi-surface electrons orbital-selectively, suggesting different roles in superconductivity and in antiferromagnetism, and making orbital characters of the moment resolvable by measuring the electronic structures. These results show that orbital sensitivity is a key factor in the magnetic properties of FeAs-based materials.

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