Duan Lei, Wei Yanteng, Feng Yagang, Zhang Hanlu, Cai Shichang, Xiao Changjiang, Wang Zhe, Jin Changqing
School of Materials Science and Engineering, Henan University of Technology, Zhengzhou 450007, China.
College of Chemistry and Material Science, Hebei Normal University, Shijiazhuang 050024, China.
Inorg Chem. 2024 Jan 8;63(1):635-641. doi: 10.1021/acs.inorgchem.3c03529. Epub 2023 Dec 15.
In this paper, we report on the discovery of a spinel compound, CoAlS, which was synthesized at high-pressure. The systematic characterizations were carried out by structural, magnetic, and heat capacity measurements. The compound crystallizes into a cubic structure with the space group 3̅ (no. 227) and the lattice constant = 9.9580(1) Å. Magnetic susceptibility measurements suggest that CoAlS exhibits a spin glass ground state, freezing at ∼ 7.2 K with a Weiss temperature ∼ -115.9 K, which is verified by ac magnetic susceptibility and heat capacity measurements. The frustration parameter for CoAlS is calculated to be about 16.6, based on the formula = | / |, indicating that CoAlS is a high-frustration magnet. Specific heat data displays a dependence below the freezing temperature, which is different from the linear dependence observed in a common spin glass system. Compared with the similar compound CoAlO, it is suggested that the vacancies in the Co sites should be responsible for the occurrence of the spin glass behavior of CoAlS.
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