Weak spin interactions in Mott insulating La2O2Fe2OSe2

McCabe, E.E.; Stock, C.; Rodriguez, E.E.; Wills, A.S.; Taylor, J.W.; Evans, J.S.O.

doi:10.1103/physrevb.89.100402

Weak spin interactions in Mott insulating La2O2Fe2OSe2

McCabe, E.E.; Stock, C.; Rodriguez, E.E.; Wills, A.S.; Taylor, J.W.; Evans, J.S.O.

Authors

Dr Emma McCabe emma.mccabe@durham.ac.uk
Associate Professor

C. Stock

E.E. Rodriguez

A.S. Wills

J.W. Taylor

Professor John Evans john.evans@durham.ac.uk
Professor

Abstract

Identifying and characterizing the parent phases of iron-based superconductors is an important step towards understanding the mechanism for their high-temperature superconductivity. We present an investigation into the magnetic interactions in the Mott insulator La2O2Fe2OSe2. This iron oxyselenide adopts a 2-k magnetic structure with low levels of magnetic frustration. This magnetic ground state is found to be dominated by next-nearest-neighbor interactions J2 and J2′ and the magnetocrystalline anisotropy of the Fe2+ site, leading to 2D-Ising-like spin S=2 fluctuations. In contrast to calculations, the values are small and confine the spin excitations below ∼25 meV. This is further corroborated by sum rules of neutron scattering. This indicates that superconductivity in related materials may derive from a weakly coupled and unfrustrated magnetic structure.

Citation

McCabe, E., Stock, C., Rodriguez, E., Wills, A., Taylor, J., & Evans, J. (2014). Weak spin interactions in Mott insulating La2O2Fe2OSe2. Physical review B, 89(10), Article 100402(R). https://doi.org/10.1103/physrevb.89.100402

Journal Article Type	Article
Publication Date	Mar 10, 2014
Deposit Date	Jun 15, 2014
Publicly Available Date	Jun 16, 2014
Journal	Physical Review B
Print ISSN	1098-0121
Electronic ISSN	1550-235X
Publisher	American Physical Society
Peer Reviewed	Peer Reviewed
Volume	89
Issue	10
Article Number	100402(R)
DOI	https://doi.org/10.1103/physrevb.89.100402

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Copyright Statement
Reprinted with permission from the American Physical Society: E. E. McCabe, C. Stock, E. E. Rodriguez, A. S. Wills, J. W. Taylor, and J. S. O. Evans, Physical Review B, 89, 100402(R), 2014. © 2014 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.