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Growth, structure and characterization of physico-chemical and magnetic properties of CdCr 2 Se 4 :Mn single crystals

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Abstract Crystal structure, magnetic and specific heat measurements, electrical conductivity, as well as DSC/TG measurements for single-crystalline CdxMnyCrzSe4 (where x + y + z ≈ 3) spinels are presented. The electrical conductivity and dc magnetic susceptibility… Click to show full abstract

Abstract Crystal structure, magnetic and specific heat measurements, electrical conductivity, as well as DSC/TG measurements for single-crystalline CdxMnyCrzSe4 (where x + y + z ≈ 3) spinels are presented. The electrical conductivity and dc magnetic susceptibility measurements exhibit thermally activated semiconducting properties and ferromagnetic (FM) order for all compositions below the Curie temperature TC = 130 K, respectively. The long-range FM interactions, defined by the Curie temperature, do not substantially depend on the manganese content, and the nearest neighbour FM interactions, represented by the positive value of the Curie-Weiss temperature, decrease from 183 K to 156 K. Hysteresis loops of all crystals have a very small coercive field (∼18 Oe) and remanence (∼0.09 μB/f.u.) with full saturation above 10 kOe. These effects are interpreted in terms of the superexchange integrals for the first two coordination spheres including spin defects.

Keywords: growth structure; chemical magnetic; characterization physico; structure; structure characterization; physico chemical

Journal Title: Journal of Alloys and Compounds
Year Published: 2018

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