Abstract

The resistivity ρ, magnetoresistance Δρ_xx/ρ₀(P), and Hall coefficient R_H are measured in a (Cd_{1 ‒ x}Zn_x)₃As₂ sample with х = 0.31 under the action of uniform pressure and at various temperatures in the range 80–400 K. These samples are obtained by the modified Bridgman method. The composition of the samples and their homogeneity are controlled by X-ray phase analysis and energy-dispersive X-ray spectroscopy. The results of energy dispersive X-ray spectroscopy show that the distribution of elements in the sample is uniform. It is found that the resistivity increases with increasing temperature, and the change in ρ(T) has a metallic character. The Hall coefficient R_H in the field decreases slightly with increasing temperature and retains a negative sign throughout the entire range under study. With increasing pressure, anomalies are observed in the baric dependences of the electrical resistivity ρ(Р), magnetoresistance Δρ_xx/ρ₀(Р), and the Hall coefficient R_H(Р). Increasing the uniform pressure leads to suppression of the positive magnetoresistance. In the phase-transition region, the negative magnetoresistance at a pressure of Р (2.4–2.7) GPa in a field of 5 kOe is a maximum value of 1.7.

中文翻译：

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(Cd1 – xZnx)3As2 在高压下的磁输运研究

摘要

在均匀压力作用下，在不同温度下，测量了х = 0.31 的 (Cd _{1 – x} Zn _x ) ₃ As ₂样品的电阻率 ρ、磁阻 Δρ _xx /ρ ₀ ( P ) 和霍尔系数R _H 。范围 80–400 K。这些样品是通过改进的布里奇曼方法获得的。样品的成分及其均匀性由 X 射线相分析和能量色散 X 射线光谱控制。能量色散X射线光谱分析结果表明样品中元素分布均匀。发现电阻率随温度升高而增大，且ρ( T )的变化具有金属特征。现场的霍尔系数R _H随着温度的升高而略有下降，并在整个研究范围内保持负号。_随着压力的增加，电阻率 ρ( Р )、磁阻 Δρ _xx /ρ ₀ ( Р ) 和霍尔系数RH ( Р ) 的气压依赖性出现异常。增加均匀压力会抑制正磁阻。在相变区， 5 kOe 磁场中Р (2.4–2.7) GPa 压力下的负磁阻最大值为 1.7。