Title

Low-Dimensional Magnetic Semimetal CrAlSe

Document Type

Article

Publication Date

10-21-2019

Abstract

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.

Publication Source (Journal or Book title)

Inorganic chemistry

First Page

13960

Last Page

13968

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