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Magnetic phase transitions in intermetallic CeCuGe compound

机译：金属间CeCuGe化合物中的磁性相变

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Electrical and magnetic properties of CeCuGe were investigated through electrical resistivity, thermal conductivity and magnetization measurements in the temperature range 2-300 K. Magnetization measurements indicate a paramagnetic to ferromagnetic transition at T= 10 K, in agreement with previous work. There are two distinct paramagnetic regimes: At high-T the magnetic moment per cerium is 2.50 μ_B, nearly equal to the expected 2.54 μ_B for Ce~(3+), while at low-T the effective moment decreases to 2.20 μ_B per cerium. This decrease is attributed to crystalline electric field effects. In the ferromagnetic region, the hysteresis curve indicates a rather small anisotropy (H_c less than 20 Oe). There is also very little remanence (the ratio of the remanence to the technical saturation magnetization is about 0.05), implying that this material is magnetically quite soft, with a very small magnetocrystalline anisotropy, contrary to what was reported in a previous investigation. In the temperature regime 10-30 K the resistivity obeys a T~2-behavior, consistent with the appearance of spin fluctuations above the ferromagnetic transition. In the same temperature regime, the thermo-power exhibits a linear rise in addition to a T~2 term, anomalous behavior which we also attribute tentatively to the development of spin fluctuations.
机译：通过在2-300 K的温度范围内的电阻率，热导率和磁化强度测量来研究CeCuGe的电和磁性能。磁化强度测量表明在T = 10 K时从顺磁到铁磁跃迁，与先前的工作一致。有两种不同的顺磁状态：在高T时，每个铈的磁矩为2.50μB，几乎等于Ce〜（3+）的预期2.54μB，而在低T时，有效磁矩减小至每个铈2.20μB。这种降低归因于晶体电场效应。在铁磁区域中，磁滞曲线显示出相当小的各向异性（H_c小于20 Oe）。剩磁也很少（剩磁与技术饱和磁化强度之比约为0.05），这表明该材料在磁性上相当柔软，具有非常小的磁晶各向异性，与先前的研究相反。在10-30 K的温度范围内，电阻率遵循T〜2行为，这与在铁磁跃迁上方出现自旋波动相一致。在相同的温度范围内，热功率除T〜2项外还呈现线性上升，这是异常行为，我们也将其暂时归因于自旋波动的发展。

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