A New Ferromagnetic Spinel System Ni(Rh_1−xCr_x)₂S₄ (0.15≤x≤0.40) with Metallic Conduction

Abstract

Magnetization and susceptibility measurements were made on a new spinel system Ni(Rh_1−xCr_x)₂S₄(0.15≤x≤0.40). The resistivity measurement was made on the several samples. The resistivity shows metallic conduction and a marked change at the Curie temperature. The samples show ferromagnetism at low temperatures. The paramagnetic susceptibility obeys χ=χ₀+C_M⁄(T−θ_P), where χ₀ is a temperature-independent paramagnetic susceptibility. Paramagnetic Curie temperature θ_P is positive in this system. The Curie constant per gramatom chromium C_M⁄2x remains approximately constant for the compositions tested. It is pointed out that the properties of the system are similar to those of a system Cu(Rh_1−xCr_x)₂Se₄.