Low spin moment due to hidden multipole order from spin-orbital ordering in LaFeAsO
2010 (English)In: Physical Review B Condensed Matter, ISSN 0163-1829, E-ISSN 1095-3795, Vol. 81, no 14, 140403- p.Article in journal (Refereed) Published
An antiferromagnetic (AF) low-moment solution, 0.35 μB / Fe, is found in the case of LaOFeAs for an intermediately strong Coulomb interaction U of 2.75 eV. This solution is stabilized over a large moment solution due to the gain in exchange energy in the formation of large multipoles of the spin magnetization density. The multipoles are of rank four and can be understood as a type of spin-orbital ordering. Parallels can be drawn to the stabilization of the AF order in, e.g., CaCuO2.
Place, publisher, year, edition, pages
2010. Vol. 81, no 14, 140403- p.
Superconductivity, correlated electrons, electronic structure calculations
Condensed Matter Physics
Research subject Physics of Matter
IdentifiersURN: urn:nbn:se:uu:diva-132063DOI: 10.1103/PhysRevB.81.140403ISI: 000277210200013OAI: oai:DiVA.org:uu-132063DiVA: diva2:356794