Mechanism of Strange Superconductivity on Kondo Lattice: Application for CeMIn₅ (M = Rh, Co)
Yung-Yeh Chang1*, F. Hsu2, S. Kirchner3, C. Y. Mou2,4, J. D. Thompson5, T. K. Lee6, C. H. Chung1,4,6
1Department of Electrophysics, National Chiao-Tung University, Hsinchu, Taiwan
2Department of Physics, National Tsing-Hua University, Hsinchu, Taiwan
3Center for Correlated Materials, Zhejiang University, Hangzhou, China
4Physics Division, National Center for Theoretical Sciences, Hsinchu, Taiwan
5Los Alamos National Laboratory, Los Alamos, New Mexico, USA
6Institute of Physics, Academia Sinica, Nankang, Taipei, Taiwan
* Presenter:Yung-Yeh Chang,
The heavy-fermion CeMIn₅ family with M = Co, Rh provide a paradigmatic example of strange superconductivity with d−wave pairing and a non-Fermi liquid (strange metal) normal state, emerged near an antiferromagnetic quantum critical point. The microscopic mechanism of strange superconductivity as well as its link to quantum criticality and strange metal behaviour are still long-standing open issues. Recent ARPES and STM measurements show evidences that both Kondo hybridization and antiferromagnetic fluctuations among f−electrons play important roles to account for their normal and superconducting states. We offer a microscopic mechanism to address these issues based on a competition and coexistence between Kondo effect and antiferromagnetic resonant- valence-bond spin liquid of the Kondo-Heisenberg model on a quasi-2d lattice. Our results agree remarkably well with the experiments.

Keywords: Heavy fermion material, strange metal, Antiferromagnetism, Kondo effect