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Enhanced Hybridization Sets the Stage for Electronic Nematicity in CeRhIn5

Journal Article · · Physical Review Letters
High magnetic fields induce a pronounced in-plane electronic anisotropy in the tetragonal antiferromagnetic metal CeRhIn5 at H* ≳ 30 T for fields ≃20° off the $$c$$ axis. Here in this paper, we investigate the response of the underlying crystal lattice in magnetic fields to 45 T via high-resolution dilatometry. At low fields, a finite magnetic field component in the tetragonal $ab$ plane explicitly breaks the tetragonal (C4) symmetry of the lattice revealing a finite nematic susceptibility. A modest a-axis expansion at H * hence marks the crossover to a fluctuating nematic phase with large nematic susceptibility. Magnetostriction quantum oscillations confirm a Fermi surface change at H * with the emergence of new orbits. By analyzing the field-induced change in the crystal-field ground state, we conclude that the in-plane Ce $$f$$ hybridization is enhanced at H * , in agreement with the in-plane lattice expansion. We argue that the nematic behavior observed in this prototypical heavy-fermion material is of electronic origin, and is driven by the hybridization between 4$$f$$ and conduction electrons which carries the $$f$$-electron anisotropy to the Fermi surface.
Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
89233218CNA000001; SC0012336
OSTI ID:
1511617
Alternate ID(s):
OSTI ID: 1489858
Report Number(s):
LA-UR--18-30371
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 1 Vol. 122; ISSN 0031-9007; ISSN PRLTAO
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Enhancement of the effective mass at high magnetic fields in CeRhIn 5 journal January 2019
Orientation of the ground-state orbital in CeCoIn 5 and CeRhIn 5 journal June 2019

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