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Weak spin interactions in Mott insulating La2O2Fe2OSe2.

McCabe, E. E. and Stock, C. and Rodriguez, E. E. and Wills, A. S. and Taylor, J. W. and Evans, J. S. O. (2014) 'Weak spin interactions in Mott insulating La2O2Fe2OSe2.', Physical review B., 89 (10). 100402(R).


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.

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Publisher 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.
Date accepted:No date available
Date deposited:16 June 2014
Date of first online publication:March 2014
Date first made open access:No date available

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