Magnetic and transport properties of new ternary uranium-based germanide U2Rh3Ge5
Magnetic and transport properties of new ternary uranium-based germanide U2Rh3Ge5
复制标题
新型三元铀基锗化物U2Rh3Ge5的磁性和输运特性
DOI：
10.1088/1361-648x/abb31a
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
Aoki D
中科院分区：
文献类型：
--
作者：
Li D X;Shimizu Y;Nakamura A;Maurya A;Sato Y J;Homma Y;Honda F;Aoki D
合成了一种新的三元铀锗化物U2 Rh 3Ge 5，并通过磁化率χ（T，H），等温磁化强度M（T，H），电阻率ρ（T）和比热C（T，H）的测量研究了其结构.该化合物具有U2 Co 3Si 5型正交晶系结构.低场χ（T）在TN = 41.5K处有一个明显的峰，对应于反铁磁相变。在70 kOe以下测量的M（H）曲线在2 K时呈现H线性行为，感应磁矩很小，但随着温度的升高，M（H）曲线呈现向上的曲率，这意味着在70 kOe以上的高场区可能存在变磁转变。随着温度的降低，ρ（T）在T> T N时缓慢增加，在T< T N时迅速减小，这可以分别基于类磁阻窄带隙模型（或c-f杂化效应）和反铁磁自旋波模型来理解。在低至0.4K的温度下，没有观察到重费米子行为或超导转变的证据。通过与同晶化合物U2 Ir 3 Si 5和准同晶化合物U2 Rh 3 Si 5的实验结果进行比较，讨论了所获得的实验结果.
A new ternary uranium germanide U 2 Rh 3 Ge 5 has been successfully synthesized and investigated by means of magnetic susceptibility χ (T, H), isothermal magnetization M (T, H), electrical resistivity ρ (T), and specific heat C (T, H) measurements. This compound is found to crystallize in the U 2 Co 3 Si 5-type orthorhombic structure. The low-field χ (T) shows a clear peak at T N= 41.5 K corresponding to an antiferromagnetic transition. The M (H) curve measured up to 70 kOe exhibits an H-linear behavior at 2 K with very small induced magnetic moments, while it shows upward curvature with increasing temperature, implying the possible presence of a metamagnetic transition in high-field region above 70 kOe. As the temperature decreases, ρ (T) increases slowly at T> T N and decreases rapidly at T< T N, which can be understood based on a semiconductor-like narrow band gap model (or the c-f hybridization effect) and an antiferromagnetic spin-wave model, respectively. No evidence of heavy-fermion behavior or superconductivity transition is observed at temperatures as low as 0.4 K. The obtained experimental results are discussed by comparing with those reported for the isomorphic compound U 2 Ir 3 Si 5 and the quasi-isomorphic compound U 2 Rh 3 Si 5.