| Citation: | Kangqiao Cheng, Wei Xie, Shuo Zou, Huanpeng Bu, Jinke Bao, Zengwei Zhu, Hanjie Guo, Chao Cao, Yongkang Luo. La2Rh3+δSb4: A new ternary superconducting rhodium-antimonide[J]. Materials Futures, 2022, 1(4): 045201. doi: 10.1088/2752-5724/ac972f
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Rhodium-containing compounds offer a fertile playground to explore novel materials with superconductivity (SC) and other fantastic electronic correlation effects. A new ternary rhodium-antimonide La2Rh3+δSb4 (δ≈1/8) has been synthesized by a Bi-flux method. It crystallizes in the orthorhombic Pr2Ir3Sb4-like structure, with the space group Pnma (No. 62). The crystalline structure appears as stacking the two-dimensional RhSb4- and RhSb5-polyhedra networks along b axis, and the La atoms embed in the cavities of these networks. Band structure calculations confirm it as a multi-band metal with a van-Hove singularity like feature at the Fermi level, whose density of states are mainly of Rh-4d and Sb-5p characters. The calculations also imply that the redundant Rh acts as charge dopant. SC is observed in this material with onset transition at Tcon≈0.8 K. Ultra-low temperature magnetic susceptibility and specific heat measurements suggest that it is an s-wave type-II superconductor. Our work may also imply that the broad Ln2Tm3+δSb4 (Ln = rare earth, Tm = Rh, Ir) family may host new material bases where new superconductors, quantum magnetism and other electronic correlation effects could be found.
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