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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. (2014) Weak spin interactions in Mott insulating La2O2Fe2OSe2. Physical Review B, 89 (10). pp. 100402-1. ISSN 1098-0121. (doi:10.1103/PhysRevB.89.100402) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1103/PhysRevB.89.100402

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.

Item Type: Article
DOI/Identification number: 10.1103/PhysRevB.89.100402
Subjects: Q Science
Q Science > QC Physics
Q Science > QD Chemistry
Divisions: Faculties > Sciences > School of Physical Sciences
Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Emma McCabe
Date Deposited: 10 Apr 2015 09:15 UTC
Last Modified: 01 Aug 2019 10:37 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/41293 (The current URI for this page, for reference purposes)
McCabe, E. E.: https://orcid.org/0000-0001-5868-4570
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