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首页> 外文期刊>Philosophical magazine, B. Physics of condensed matter, electronic, optical, and magnetic properties >Influence of the inhomogeneous distribution of components on itinerant-5f-electron metamagnetism in UCoAl under high pressures
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Influence of the inhomogeneous distribution of components on itinerant-5f-electron metamagnetism in UCoAl under high pressures

机译：高压下组分的不均匀分布对UCoAl中流动性5f电子亚磁性的影响

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摘要

We have performed a comparative study of the magnetization process and the magnetic susceptibility under pressure on a stoichiometric UCoAI single crystal and an off-stoichiometric U0.9Co1.05Al1.05 single crystal of the anisotropic itinerant-5f-electron metamagnet UCoAI. Both UCoAI and U0.9Co1.05Al1.05 exhibit a metamagnetic transition to the ferromagnetic state with a magnetic moment M approximate to 0.3 mu (B) (U atom)(-1) in magnetic fields applied along the c axis. The critical field B-c of the transition increases with increasing pressure and temperature. The temperature dependence of the susceptibility shows a broad maximum at a temperature T-max that gradually increases with increasing pressure. At ambient pressure, the transition in UCoAI is of first order below 12 K and of second order at 12-20 K. Broadening of the transition in U0.9Co1.05Al1.05 at low temperatures is attributed rather to a variation in the B-c value over the crystal (which can be described by Gaussian distribution with a half-width of 0.7T at ambient pressure) due to a difference in ligand neighbourhood of U atoms rather than to a second-order transition. This conclusion is corroborated by an observed hysteresis in the transition that compares well with the hysteresis of the transition in UCoAI. The experimental data have been analysed within a theory of itinerant-electron metamagnetism considering anisotropic thermal fluctuations in the magnetic moment. For homogeneous UCoAI, quantitative agreement between theory and experiment has been found, whereas the behaviour of the heterogeneous U0.9Co1.05Al1.05 sample can be explained within the theory only qualitatively. [References: 24]
机译：我们已经对化学计量的UCoAI单晶和各向异性的流动剂5f电子超磁体UCoAI的非化学计量U0.9Co1.05Al1.05单晶在压力下的磁化过程和磁化率进行了比较研究。在沿c轴施加的磁场中，UCoAI和U0.9Co1.05Al1.05均显示出向铁磁状态的亚磁跃迁，磁矩M约为0.3μ（B）（U原子）（-1）。转变的临界场B-c随着压力和温度的升高而增加。磁化率的温度依赖性在温度T-max处显示出很大的最大值，该最大值随着压力的增加而逐渐增加。在环境压力下，UCoAI的转变在12 K以下处于一阶，在12-20 K时处于第二阶。在低温下U0.9Co1.05Al1.05的转变变宽是由于Bc值的变化所致由于U原子的配体邻域差异而不是二次跃迁，导致晶体上的结晶（可以用高斯分布在环境压力下具有0.7T的半峰宽度来描述）引起。与UCoAI中的过渡磁滞相比，过渡中观察到的磁滞可以证实这一结论。考虑到磁矩的各向异性热涨落，在迭代电子亚磁理论中对实验数据进行了分析。对于均质UCoAI，已发现理论与实验之间存在定量一致性，而异质U0.9Co1.05Al1.05样品的行为只能在理论内进行定性解释。 [参考：24]

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