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Tracing crystal-field splittings in the rare-earth-based intermetallic CeIrIn 5

DOI: 10.1103/PhysRevB.97.075149 DOI Help

Authors: Q. Y. Chen (Fudan University; Science and Technology on Surface Physics and Chemistry Laboratory) , C. H. P. Wen (Fudan University) , Q. Yao (Fudan University) , K. Huang (Fudan University) , Z. F. Ding (Fudan University) , L. Shu (Fudan University) , X. H. Niu (Fudan University) , Y. Zhang (Science and Technology on Surface Physics and Chemistry Laboratory) , X. C. Lai (Science and Technology on Surface Physics and Chemistry Laboratory) , Y. B. Huang (Shanghai Institute of Applied Physics) , G. B. Zhang (National Synchrotron Radiation Laboratory, University of Science and Technology of China) , 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 B , VOL 97

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

Abstract: Crystal electric field states in rare earth intermetallics show an intricate entanglement with the many-body physics that occurs in these systems and that is known to lead to a plethora of electronic phases. Here we attempt to trace different contributions to the crystal electric field (CEF) splittings in CeIrIn5, a heavy-fermion compound and member of the CeMIn5 (M= Co, Rh, Ir) family. To this end, we utilize high-resolution resonant angle-resolved photoemission spectroscopy (ARPES) and present a spectroscopic study of the electronic structure of this unconventional superconductor over a wide temperature range. As a result, we show how ARPES can be used in combination with thermodynamic measurements or neutron scattering to disentangle different contributions to the CEF splitting in rare earth intermetallics. We also find that the hybridization is stronger in CeIrIn5 than CeCoIn5 and the effects of the hybridization on the Fermi volume increase is much smaller than predicted. By providing experimental evidence for 4f 1 7/2 splittings which, in CeIrIn5, split the octet into four doublets, we clearly demonstrate the many-body origin of the so-called 4f 1 7/2 state.

Journal Keywords: Electronic structure; Heavy-fermion systems; Transition-metal rare-earth alloys; Angle-resolved photoemission spectroscopy

Subject Areas: Physics, Materials

Instruments: I05-ARPES

Other Facilities: Shanghai Synchrotron Radiation Facility; National Synchrotron Radiation Laboratory