Journal
INORGANIC CHEMISTRY
Volume 55, Issue 15, Pages 7407-7413Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.inorgchem.6b00610
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Funding
- JSPS KAKENHI Grants [26410089, 261400]
- Graduate School of Science, Kyoto University
- Grants-in-Aid for Scientific Research [26410089, 16H04131] Funding Source: KAKEN
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Physical properties of new S = 3/2 triangular-lattice compounds LiCrSe2, LiCrTe2, and NaCrTe2 have been investigated by X-ray diffraction and magnetic measurements. These Compounds crystallize in the ordered NiAs-type structure, where alkali metal ions and Cr atoms stack alternately. Despite their isomorphic structures, magnetic properties of these three compounds are different; NaCrTe2 has an A-type spin structure with ferromagnetic layers, LiCrTe2 is likely to exhibit a helical spin structure, and LiCrSe2 shows a first-order-like phase transition from the paramagnetic trigonal phase to the antiferromagnetic monoclinic phase. In these compounds and the other chromium chalcogenides with a triangular lattice, we found a general relationship between the Curie-Weiss temperature and magnetic structures. This relation indicates that the competition between the antiferromagnetic direct d-d exchange interaction and the ferromagnetic superexchange interaction plays an important role in determining the ground state of chromium chalcogenides.
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