Crystal Structure and Magnetic Properties of the Ferromagnet CoMnSb

Abstract

The half-Heusler intermetallic ferromagnet CoMSb (M = V, Cr, and Mn) is theoretically predicted to realize large anomalous Nernst effect. We successfully synthesized single crystals of CoMnSb, which has the highest Curie temperature of 490 K in the CoMSb enough for Nernst type thermoelectric device to be applicable at room temperature. The powder X-ray diffraction measurements show that the obtained crystals have the 2 × 2 × 2 superlattice structure (= 11.835 Å) of half-Heusler CoMnSb (= 5.875 Å). The observed magnetization saturated around 4 B /f.u., which also indicates that the obtained CoMnSb crystals have the superlattice structure.

The Temperature Effect on the Physical Properties of CoMnSb Half-Heusler Ferromagnetic: Density Functional Theory and Monte Carlo Simulation

“…The saturated magnetization decreases with temperature increase in good agreement with that obtained in Ref. 44.…”