A new ternary uranium germanide U2Rh3Ge5 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 U2Co3Si5-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 U2Ir3Si5 and the quasi-isomorphic compound U2Rh3Si5.

中文翻译：

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新型三元铀基锗化物 U2Rh3Ge5 的磁性和输运性质

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) 测量成功合成和研究了一种新的三元锗化铀 U2Rh3Ge5 . 发现该化合物以 U2Co3Si5 型正交结构结晶。低场 χ(T) 在 TN = 41.5 K 处显示出明显的峰值，对应于反铁磁跃迁。测量到 70 kOe 的 M(H) 曲线在 2 K 时表现出 H 线性行为，感应磁矩非常小，而随着温度的升高，它显示出向上的曲率，这意味着在上面的高场区域中可能存在超磁跃迁70 千瓦时。随着温度的降低，ρ(T) 在 T > TN 时缓慢增加，在 T < TN 时迅速减小，这可以分别基于类似半导体的窄带隙模型（或 cf 杂化效应）和反铁磁自旋波模型来理解。在低至 0.4 K 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 U2Ir3Si5 和准同晶化合物 U2Rh3Si5 报告的结果进行比较，讨论了获得的实验结果。