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Band Dependent Interlayer f -Electron Hybridization in CeRhIn 5

DOI: 10.1103/PhysRevLett.120.066403 DOI Help

Authors: Q. Y. Chen (Fudan University; China Academy of Engineering Physics (CAEP)) , D. F. Xu (Fudan University) , X. H. Niu (Fudan University) , R. Peng (Fudan University) , H. C. Xu (Fudan University) , C. H. P. Wen (Fudan University) , X. Liu (Fudan University) , L. Shu (Fudan University) , S. Y. Tan (China Academy of Engineering Physics (CAEP)) , X. C. Lai (China Academy of Engineering Physics (CAEP)) , Y. J. Zhang (Los Alamos National Laboratory) , H. Lee (Zhejiang University) , V. N. Strocov (Swiss Light Source) , F. Bisti (Swiss Light Source) , P. Dudin (Diamond Light Source) , J.-x. Zhu (Los Alamos National Laboratory) , H. Q. Yuan (Zhejiang University; Collaborative Innovation Center of Advanced Microstructures) , S. Kirchner (Zhejiang University) , D. L. Feng (Fudan University; Collaborative Innovation Center of Advanced Microstructures)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Letters , VOL 120

State: Published (Approved)
Published: February 2018
Diamond Proposal Number(s): 11914

Abstract: A key issue in heavy fermion research is how subtle changes in the hybridization between the 4f (5f) and conduction electrons can result in fundamentally different ground states. CeRhIn5 stands out as a particularly notable example: when replacing Rh with either Co or Ir, antiferromagnetism gives way to superconductivity. In this photoemission study of CeRhIn5, we demonstrate that the use of resonant angle-resolved photoemission spectroscopy with polarized light allows us to extract detailed information on the 4f crystal field states and details on the 4f and conduction electron hybridization, which together determine the ground state. We directly observe weakly dispersive Kondo resonances of f electrons and identify two of the three Ce 4f 1 5/2 crystal-electric-field levels and band-dependent hybridization, which signals that the hybridization occurs primarily between the Ce 4f states in the CeIn3 layer and two more three-dimensional bands composed of the Rh 4d and In 5p orbitals in the RhIn2 layer. Our results allow us to connect the properties observed at elevated temperatures with the unusual low-temperature properties of this enigmatic heavy fermion compound.

Journal Keywords: Electronic structure; Heavy-fermion systems; Angle-resolved photoemission spectroscopy

Subject Areas: Materials, Physics


Instruments: I05-ARPES