Low-Dimensional Magnetic Semimetal CrAlSe.

Inorg Chem

Department of Chemistry , Louisiana State University, Baton Rouge , Louisiana 70803 , United States.

Published: October 2019

While exploring novel magnetic semiconductors, the new phase CrAlSe was discovered and characterized by both structural and physical properties. CrAlSe was found to crystallize into orthorhombic CrGeTe-type structure with space group (no. 62). Vacancies and mixed occupancies were tested, and the results show that one of the 4 sites accommodates a mixture of Cr and Al atoms, while the other 4 site is fully occupied by Al atoms. Unique structural features include a T-shaped channel network created from the edge-sharing Cr/Al@Se and Al@Se polyhedra and a zipper effect of the puckered Se atoms inside the columnar channels. The round peak observed in the temperature-dependent magnetic susceptibility (χ) plot at ∼8(1) K corresponds to the antiferromagnetic-type transition in CrAlSe. However, the positive θ indicates an additional ferromagnetic interaction, which is highly likely due to the complex magnetic structure arising from the mixed Cr/Al occupancies on the 4 site. Electrical resistivity measurements confirm that CrAlSe is a semimetal with a positive magnetoresistance. Here we present the characterization and determination of the crystal structure and physical properties for this new material.

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Source
http://dx.doi.org/10.1021/acs.inorgchem.9b01913DOI Listing

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