Magnetic State of Pyrochlore Cd2Os2O7 Emerging from Strong Competition of Ligand Distortions and Longer-Range Crystalline Anisotropy

Abstract : By 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 antiferromag- netic exchange interaction (J ≈ 6.4 meV) stabilizes an all-in–all-out magnetic order. The competition uncovered here is a generic feature of pyrochlore magnets.
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Physical Review Letters, American Physical Society, 2013, 110, pp.127206. 〈10.1103/PhysRevLett.110.127206〉
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Nikolay Bogdanov, Rémi Maurice, Ioannis Rousochatzakis, Jeroen Van den Brink, Liviu Hozoi. Magnetic State of Pyrochlore Cd2Os2O7 Emerging from Strong Competition of Ligand Distortions and Longer-Range Crystalline Anisotropy. Physical Review Letters, American Physical Society, 2013, 110, pp.127206. 〈10.1103/PhysRevLett.110.127206〉. 〈in2p3-01629470〉

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