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19 April 2024

» arxiv » 1101.2847

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Magnetic Frustration in a Mn Honeycomb Lattice Induced by Mn-O-O-Mn Pathways
H. Wadati ; K. Kato ; Y. Wakisaka ; T. Sudayama ; D. G. Hawthorn ; T. Z. Regier ; N. Onishi ; M. Azuma ; Y. Shimakawa ; T. Mizokawa ; A. Tanaka ; G. A. Sawatzky ;
Date:	14 Jan 2011
Abstract:	We investigated the electronic structure of layered Mn oxide Bi3Mn4O12(NO3) with a Mn honeycomb lattice by x-ray absorption spectroscopy. The valence of Mn was determined to be 4+ with a small charge-transfer energy. We estimated the values of superexchange interactions up to the fourth nearest neighbors (J1, J2, J3, and J4) by unrestricted Hartree-Fock calculations and a perturbation method. We found that the absolute values of J1 through J4 are similar with positive (antiferromagnetic) J1 and J4, and negative (ferromagnetic) J2 and J3, due to Mn-O-O-Mn pathways activated by the smallness of charge-transfer energy. The negative J3 provides magnetic frustration in the honeycomb lattice to prevent long-range ordering.
Source:	arXiv, 1101.2847
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