Magnetic frustration driven by itinerancy in spinel CoV2O4

J. H. Lee, J. Ma, S. E. Hahn, H. B. Cao, M. Lee, Tao Hong, H. J. Lee, M. S. Yeom, S. Okamoto, H. D. Zhou, M. Matsuda, R. S. Fishman

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24 Scopus citations

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 CoV2O4, 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.

Original languageEnglish
Article number17129
JournalScientific Reports
Volume7
Issue number1
DOIs
StatePublished - Dec 1 2017

Funding

The work at UNIST (J.H.L., H.-J.L., M.L.) was supported by National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP)(2015R1C1A1A01055760), Basic Research Laboratory (NRF-2017R1A4A1015323), and Creative MaterialsDiscovery Program through the NRF funded by the Ministry of Science and ICT(2017M3D1A1040828). J.M. thanks the support of the Ministry of Science and Technology of China (2016YFA0300500). The research at ORNL were sponsored by Department of Energy, Office of Sciences, Basic Energy Sciences, Materials Sciences and Engineering Division (S.O., R.F.) and Scientific User Facilities Division (J.M., S.E.H., M.M.). S.E.H. acknowledges support by the Laboratory's Director's fund, ORNL. H.D.Z thanks the support from NSF with grant NSF-DMR-1350002. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors acknowledge valuable discussions with G. MacDougall. The work at UNIST (J.H.L., H.-J.L., M.L.) was supportedby National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP)(2015R1C1A1A01055760), Basic Research Laboratory (NRF-2017R1A4A1015323), and Creative MaterialsDiscovery Program through the NRF funded by the Ministry of Science and ICT(2017M3D1A1040828) . J.M. thanks the support of the Ministry of Science and Technology of China (2016YFA0300500). The research at ORNL were sponsored by Department of Energy, Office of Sciences, Basic Energy Sciences, Materials Sciences and Engineering Division (S.O., R.F.) and Scientific User Facilities Division (J.M., S.E.H., M.M.). S.E.H. acknowledges support by the Laboratory’s Director’s fund, ORNL. H.D.Z thanks the support from NSF with grant NSF-DMR-1350002. This research used resources of the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC02-05CH11231. The authors acknowledge valuable discussions with G. MacDougall.

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