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.

中文翻译：

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CdCr 2 Se 4 :Mn 单晶的生长、结构和物理化学和磁性能表征

摘要 介绍了单晶 CdxMnyCrzSe4（其中 x + y + z ≈ 3）尖晶石的晶体结构、磁和比热测量、电导率以及 DSC/TG 测量。对于低于居里温度 TC = 130 K 的所有组合物，电导率和直流磁化率测量值分别显示出热激活半导体特性和铁磁 (FM) 顺序。由居里温度定义的长程 FM 相互作用基本上不依赖于锰含量，而最近邻 FM 相互作用（由居里 - 魏斯温度的正值表示）从 183 K 降低到 156 K。 滞后所有晶体的环都具有非常小的矫顽场 (∼18 Oe) 和剩磁 (∼0.09 μB/fu)，完全饱和度高于 10 kOe。