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Anisotropic c – f Hybridization in the Ferromagnetic Quantum Critical Metal CeRh6Ge4

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [1];  [1];  [1];  [1];  [3];  [4];  [1];  [5];  [1]
  1. Zhejiang Univ., Hangzhou (China)
  2. Zhejiang Univ., Hangzhou (China); Hubei Normal Univ., Huangshi (China)
  3. Hangzhou Normal Univ. (China)
  4. Zhejiang Univ., Hangzhou (China); Max Planck Inst. for Chemical Physics of Solids, Dresden (Germany)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
+ Show Author Affiliations
Heavy fermion compounds exhibiting a ferromagnetic quantum critical point have attracted considerable interest. Common to two known cases, i.e., CeRh6Ge4 and YbNi4P2, is that the 4f moments reside along chains with a large interchain distance, exhibiting strong magnetic anisotropy that was proposed to be vital for the ferromagnetic quantum criticality. Here, we report an angle-resolved photoemission study on CeRh6Ge4 in which we observe sharp momentum-dependent 4f bands and clear bending of the conduction bands near the Fermi level, indicating considerable hybridization between conduction and 4f electrons. The extracted hybridization strength is anisotropic in momentum space and is obviously stronger along the Ce chain direction.The hybridized 4f bands persist up to high temperatures, and the evolution of their intensity shows clear band dependence. Our results provide spectroscopic evidence for anisotropic hybridization between conduction and 4f electrons in CeRh6Ge4, which could be important for understanding the electronic origin of the ferromagnetic quantum criticality.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1821871
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 126; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
Angle-resolved photoemission spectroscopy
Electronic structure
Ferromagnets
Heavy-fermion systems
Kondo effect
Quantum phase transitions