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Spin superstructure and noncoplanar ordering in metallic pyrochlore magnets with degenerate orbitals

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arxiv 1108.3066 v1 pith:EFMCMOBR submitted 2011-08-15 cond-mat.str-el cond-mat.mtrl-sci

Gia-Wei Chern , Cristian D. Batista This is my paper · ORCID
classification cond-mat.str-elcond-mat.mtrl-sci
keywords electronsitinerantlocalizednoncoplanarorbitalspyrochlorespinspins
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We study double-exchange models with itinerant t2g electrons in spinel and pyrochlore crystals. In both cases the localized spins form a network of corner-sharing tetrahedra. We show that the strong directional dependence of t2g orbitals leads to unusual Fermi surfaces that induce spin superstructures and noncoplanar orderings for a weak coupling between itinerant electrons and localized spins. Implications of our results to ZnV2O4 and Cd2Os2O7 are also discussed.

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