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  Magnetic order and crystalline electric field excitations of the quantum critical heavy-fermion ferromagnet CeRh6Ge4

Shu, J. W., Adroja, D. T., Hillier, A. D., Zhang, Y. J., Chen, Y. X., Shen, B., et al. (2021). Magnetic order and crystalline electric field excitations of the quantum critical heavy-fermion ferromagnet CeRh6Ge4. Physical Review B, L140411, pp. 1-6. doi:10.1103/PhysRevB.104.L140411.

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 Creators:
Shu, J. W.1, Author
Adroja, D. T.1, Author
Hillier, A. D.1, Author
Zhang, Y. J.1, Author
Chen, Y. X.1, Author
Shen, B.1, Author
Orlandi, F.1, Author
Walker, H. C.1, Author
Liu, Y.1, Author
Cao, C.1, Author
Steglich, F.2, Author              
Yuan, H. Q.1, Author
Smidman, M.1, Author
Affiliations:
1External Organizations, ou_persistent22              
2Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863467              

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Free keywords: Cerium compounds, Excited states, Ferromagnetic materials, Ferromagnetism, Germanium alloys, Germanium compounds, Ground state, Hydrostatic pressure, Magnetic susceptibility, Magnetocrystalline anisotropy, Magnets, Neutron scattering, Organometallics, Single crystals, Superconducting materials, Anomalous behavior, Coherent oscillations, Crystalline electric fields, Electric field excitation, Heavy-fermion, Hybridisation, Magnetic Bragg peaks, Magnetic orders, Quantum critical, Quantum-critical point, Electric fields
 Abstract: CeRh6Ge4 is an unusual example of a stoichiometric heavy fermion ferromagnet, which can be cleanly tuned by hydrostatic pressure to a quantum critical point. To understand the origin of this anomalous behavior, we have characterized the magnetic ordering and crystalline electric field (CEF) scheme of this system. While magnetic Bragg peaks are not resolved in neutron powder diffraction, coherent oscillations are observed in zero-field μSR below TC, which are consistent with in-plane ferromagnetic ordering consisting of reduced Ce moments. From analyzing the magnetic susceptibility and inelastic neutron scattering, we propose a CEF-level scheme which accounts for the easy-plane magnetocrystalline anisotropy, where the low lying first excited CEF exhibits significantly stronger hybridization than the ground state. These results suggest that the orbital anisotropy of the ground state and low-lying excited state doublets are important for realizing anisotropic electronic coupling between the f and conduction electrons, which gives rise to the highly anisotropic hybridization observed in photoemission experiments. © 2021 American Physical Society.

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Language(s): eng - English
 Dates: 2021-10-292021-10-29
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: DOI: 10.1103/PhysRevB.104.L140411
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: - Sequence Number: L140411 Start / End Page: 1 - 6 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008