La_(2)Rh_(3+δ)Sb_(4):a new ternary superconducting rhodium-antimonide  

作　　者：Kangqiao Cheng Wei Xie Shuo Zou Huanpeng Bu Jin-Ke Bao Zengwei Zhu Hanjie Guo Chao Cao Yongkang Luo 

机构地区：[1]Wuhan National High Magnetic Field Center and School of Physics,Huazhong University of Science and Technology,Wuhan 430074,People’s Republic of China [2]Neutron Science Platform,Songshan Lake Materials Laboratory,Dongguan,Guangdong 523808,People’s Republic of China [3]Department of Physics,Materials Genome Institute and International Center for Quantum and Molecular Structures,Shanghai University,Shanghai 200444,People’s Republic of China [4]Center for Correlated Matter and School of Physics,Zhejiang University,Hangzhou 310058,People’s Republic of China

出　　处：《Materials Futures》2022年第4期155-163,共9页材料展望（英文）

基　　金：This work was supported by the open research fund of Songshan Lake Materials Laboratory(2022SLABFN27);NSF of China(Grants Nos.12004270,51861135104,11574097,12204298,12274364 and 11874137);the Fundamental Research Funds for the Central Universities of China(2019kfyXMBZ071);Guangdong Basic and Applied Basic Research Foundation(2019A1515110517);the Pioneer and Leading Goose R&D Program of Zhejiang(2022SDXHDX0005).

摘　　要：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 La_(2)Rh_(3)+δSb_(4)(δ≈1/8)has been synthesized by a Bi-flux method.It crystallizes in the orthorhombic La_(2)Rh_(3+δ)Sb_(4)-like structure,with the space group Pnma(No.62).The crystalline structure appears as stacking the two-dimensional RhSb_(4)-and RhSb_(5)-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 Ton c≈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 Ln_(2)Tm_(3+δ)Sb_(4)(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.

关 键 词：SUPERCONDUCTIVITY electronic correlation effect crystalline structure 

分 类 号：TB34[一般工业技术—材料科学与工程]