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Magnetic Frustration Driven by Itinerancy in Spinel CoV2O4

2017; Nature Portfolio; Volume: 7; Issue: 1 Linguagem: Inglês

10.1038/s41598-017-17160-0

2045-2322

Jun Hee Lee, Jie Ma, Steven Hahn, Huibo Cao, Minseong Lee, Tao Hong, Hyeongeon Lee, Min Sun Yeom, Satoshi Okamoto, Haidong Zhou, M. Matsuda, R. S. Fishman,

Multiferroics and related materials

Abstract Localized spins and itinerant electrons rarely coexist in geometrically-frustrated spinel lattices. They exhibit a complex interplay between localized spins and itinerant electrons. In this paper, we study the origin of the unusual spin structure of the spinel CoV 2 O 4 , which stands at the crossover from insulating to itinerant behavior using the first principle calculation and neutron diffraction measurement. In contrast to the expected paramagnetism, localized spins supported by enhanced exchange couplings are frustrated by the effects of delocalized electrons. This frustration produces a non-collinear spin state even without orbital orderings and may be responsible for macroscopic spin-glass behavior. Competing phases can be uncovered by external perturbations such as pressure or magnetic field, which enhances the frustration.