Frustrated Magnetism in Mott Insulating (V1-xCrx)2 O3

J. C. Leiner, Harald Olaf Jeschke, R. Valentí, S. Zhang, A. T. Savici, J. Y.Y. Lin, M. B. Stone, M. D. Lumsden, Jiawang Hong, O. Delaire, Wei Bao, C. L. Broholm

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Abstract

V2O3 famously features all four combinations of paramagnetic versus antiferromagnetic and metallic versus insulating states of matter in response to percent-level doping, pressure in the GPa range, and temperature below 300 K. Using time-of-flight neutron spectroscopy combined with density functional theory calculations of magnetic interactions, we have mapped and analyzed the inelastic magnetic neutron scattering cross section over a wide range of energy and momentum transfer in the chromium-stabilized antiferromagnetic and paramagnetic insulating phases. Our results reveal an important magnetic frustration and degeneracy of the paramagnetic insulating phase which is relieved by the rhombohedral-to-monoclinic transition at TN=185 K. This leads to the recognition that magnetic frustration is an inherent property of the paramagnetic phase in (V1-xCrx)2O3 and plays a key role in suppressing the magnetic long-range-ordering temperature and exposing a large phase space for the paramagnetic Mott metal-insulator transition to occur.

Original languageEnglish
Article number011035
Pages (from-to)011035
JournalPhysical Review X
Volume9
Issue number1
DOIs
Publication statusPublished - Feb 21 2019

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Leiner, J. C., Jeschke, H. O., Valentí, R., Zhang, S., Savici, A. T., Lin, J. Y. Y., Stone, M. B., Lumsden, M. D., Hong, J., Delaire, O., Bao, W., & Broholm, C. L. (2019). Frustrated Magnetism in Mott Insulating (V1-xCrx)2 O3. Physical Review X, 9(1), 011035. [011035]. https://doi.org/10.1103/PhysRevX.9.011035