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Download fileMagnetic state of pyrochlore Cd2Os2O7 emerging from strong competition of ligand distortions and longer-range crystalline anisotropy
journal contribution
posted on 2018-08-14, 15:52 authored by Nikolay A. Bogdanov, Remi Maurice, Ioannis RousochatzakisIoannis Rousochatzakis, Jeroen van den Brink, Liviu HozoiBy many-body quantum-chemical calculations, we investigate the role of two structural effects - local ligand distortions and the anisotropic Cd-ion coordination - on the magnetic state of Cd2Os2O7, a spin S=3/2 pyrochlore. We find that these effects strongly compete, rendering the magnetic interactions and ordering crucially dependent on these geometrical features. Without trigonal distortions, a large easy-plane magnetic anisotropy develops. Their presence, however, reverses the sign of the zero-field splitting and causes a large easy-axis anisotropy (D-6.8 meV), which in conjunction with the antiferromagnetic exchange interaction (Ja6.4 meV) stabilizes an all-in-all-out magnetic order. The competition uncovered here is a generic feature of pyrochlore magnets.
Funding
N. A. B. and L. H. acknowledge financial support from the Erasmus Mundus Programme of the European Union and the German Research Foundation (Deutsche Forschungsgemeinschaft, DFG), respectively.
History
School
- Science
Department
- Physics
Published in
Physical Review LettersVolume
110Issue
12Citation
BOGDANOV, N.A. ... et al, 2013. Magnetic state of pyrochlore Cd2Os2O7 emerging from strong competition of ligand distortions and longer-range crystalline anisotropy. Physical Review Letters, 110 (12), 127206.Publisher
© American Physical SocietyVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
2013Notes
This paper was published in the journal Physical Review Letters and the definitive published version is available at https://doi.org/10.1103/PhysRevLett.110.127206.ISSN
0031-9007eISSN
1079-7114Publisher version
Language
- en