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Nontrivial order parameter in Sr2IrO4
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
2015 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 91, no 2, 020404- p.Article in journal (Refereed) Published
Abstract [en]

A thorough analysis of the ground state of the relativistic magnetic insulator Sr2IrO4 is performed. The results are in accordance with the small antiferromagnetic moment and gapped state found in experiment. The solution, obtained using the DFT+SO+U methodology, is thoroughly analyzed in terms of Landau theory. We find that the ordered magnetic moment only forms a secondary order parameter while the primary order parameter is a higher order magnetic multipole of rank five. It is further observed that the electronic structure in the presence of this order parameter is related to the earlier proposed j(eff) = 1/2 model, but in contrast to that model, the present picture can exactly explain the small magnitude of the ordered magnetic moments.

Place, publisher, year, edition, pages
2015. Vol. 91, no 2, 020404- p.
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URN: urn:nbn:se:uu:diva-246367DOI: 10.1103/PhysRevB.91.020404ISI: 000348473700001OAI: oai:DiVA.org:uu-246367DiVA: diva2:793375
Available from: 2015-03-06 Created: 2015-03-05 Last updated: 2017-12-04Bibliographically approved

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Ganguly, ShreemoyeeGranas, OscarNordstrom, Lars

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