Magnetic and transport properties of new ternary uranium-based germanide U2Rh3Ge5. (17th September 2020)

• Record Type: Journal Article
• Authors: Li, D X; Shimizu, Y; Nakamura, A; Maurya, A; Sato, Y J; Homma, Y; Honda, F; Aoki, D
• Is Part Of: Journal of physics. Volume 32:Number 49(2020)
• Publication Date: 2020-09-17
• Subjects: U2Rh3Ge5 -- magnetic susceptibility -- magnetization -- specific heat -- electrical resistivity; Condensed matter -- Periodicals; Matière condensée -- Périodiques; Vaste stoffen; Vloeistoffen; Natuurkunde; Electronic journals; Computer network resources; 530.4105
• DOI: 10.1088/1361-648X/abb31a
• Languages: English
• ISSNs: 0953-8984

Abstract

Abstract: A new ternary uranium germanide U2 Rh3 Ge5 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 U2 Co3 Si5 -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 U2 Ir3 Si5 and the quasi-isomorphic compound U2 Rh3 Si5 .