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Spin and Orbital States in Triclinic Ilmenite-Type CuVO3
Hajime Yamamoto1, Keigo Ochi2, Takuya Aoyama2
1Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, Miyagi 980-8577, Japan.
None:
Ilmenite-type CuVO3 is a promising compound for exploring novel spin and orbital states, as Cu2+ (3d9) and V4+ (3d1) ions each form a honeycomb lattice. In this study, we synthesized triclinic ilmenite-type CuVO3 using a high-pressure and high-temperature method and investigated its spin and orbital states through synchrotron X-ray diffraction and measurements of electrical resistivity, magnetic susceptibility, and specific heat. The Cu2+ ions exhibit the Jahn-Teller effect, leading to the triclinic distortion. This Jahn-Teller distortion hinders the formation of static V-V dimers, in contrast to other ilmenite-type vanadium oxides in which V-V dimerization is observed. These findings highlight triclinic ilmenite-type CuVO3 as a fascinating system in which each cation exhibits characteristic spin and orbital states.
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