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Charge localization, frustration relief, and spin-orbit coupling in U₃O₈

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arxiv 2301.09343 v1 pith:D3DI4W62 submitted 2023-01-23 cond-mat.str-el

Charge localization, frustration relief, and spin-orbit coupling in U₃O₈

classification cond-mat.str-el
keywords couplingbandchargefrustrationlocalizationmagneticorderresults
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Research efforts on the low temperature magnetic order and electronic properties of U$_3$O$_8$ have been inconclusive so far. Reinterpreting neutron scattering results, we use group representation theory to show that the ground state presents collinear out-of-plane magnetic moments, with antiferromagnetic coupling both in-layer and between layers. Charge localization relieves the initial geometric frustration, generating a slightly distorted honeycomb sublattice with N\'eel order. We show, furthermore, that spin-orbit coupling has a giant effect on the conduction band states and band gap value. Our results allow a reinterpretation of recent optical absorption measurements.

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