Multiferroic FeTe\(_2\)O\(_5\)Br: Alternating spin chains with frustrated interchain interactions

Multiferroic FeTe\(_2\)O\(_5\)Br: Alternating spin chains with frustrated interchain interactions

A combination of density functional theory calculations, many-body model considerations, magnetization and electron spin resonance measurements shows that the multiferroic FeTe\(_2\)O\(_5\)Br should be described as a system of alternating antiferromagnetic \(S=5/2\) chains with strong Fe-O-Te-O-Fe b...

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Veröffentlicht in:arXiv.org 2012-08
Hauptverfasser: Pregelj, M, Jeschke, H O, Feldner, H, Valentí, R, Honecker, A, Saha-Dasgupta, T, Das, H, Yoshii, S, Morioka, T, Nojiri, H, Berger, H, Zorko, A, Zaharko, O, Arčon, D
Format: Artikel
Sprache:eng
Schlagworte:
Antiferromagnetism
Chains
Density functional theory
Electric bridges
Electric polarization
Electron paramagnetic resonance
Electron spin
Electrons
Multiferroic materials
Spin resonance
Temperature dependence
Two dimensional models
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Zusammenfassung:A combination of density functional theory calculations, many-body model considerations, magnetization and electron spin resonance measurements shows that the multiferroic FeTe\(_2\)O\(_5\)Br should be described as a system of alternating antiferromagnetic \(S=5/2\) chains with strong Fe-O-Te-O-Fe bridges weakly coupled by two-dimensional frustrated interactions, rather than the previously reported tetramer models. The peculiar temperature dependence of the incommensurate magnetic vector can be explained in terms of interchain exchange striction being responsible for the emergent net electric polarization.
ISSN:2331-8422
DOI:10.48550/arxiv.1202.4799