Ce₃Bi₄Ni₃ − a large hybridization-gap variant of Ce₃Bi₄Pt₃

  • The family of cubic noncentrosymmetric 3-4-3 compounds has become a fertile ground for the discovery of novel correlated metallic and insulating phases. Here, we report the synthesis of a new heavy fermion compound, Ce3Bi4Ni3. It is an isoelectronic analog of the prototypical Kondo insulator Ce3Bi4Pt3 and of the recently discovered Weyl-Kondo semimetal Ce3Bi4Pd3. In contrast to the volume-preserving Pt-Pd substitution, structural and chemical analyses reveal a positive chemical pressure effect in Ce3Bi4Ni3 relative to its heavier counterparts. Based on the results of electrical resistivity, Hall effect, magnetic susceptibility, and specific heat measurements, we identify an energy gap of 65-70 meV, about eight times larger than that in Ce3Bi4Pt3 and about 45 times larger than that of the Kondo-insulating background hosting the Weyl nodes in Ce3Bi4Pd3. We show that this gap as well as other physical properties do not evolve monotonically with increasing atomic number, i.e., in the sequence Ce3Bi4Ni3-Ce3Bi4Pd3-Ce3Bi4Pt3, but instead with increasing partial electronic density of states of the d orbitals at the Fermi energy. To understand under which condition topological states form in these materials is a topic for future studies.

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Author:Diana M. KirschbaumORCiD, Xinlin YanORCiDGND, Monika Waas, Robert Svagera, Andrey ProkofievORCiDGND, Berthold StögerORCiDGND, Gerald GiesterORCiD, Peter RoglORCiDGND, Diana-Gabriela Oprea, Claudia FelserORCiDGND, Roser ValentíORCiDGND, Maia G. VergnioryORCiDGND, Jeroen CustersORCiDGND, Silke PaschenORCiDGND, Diego Andres ZoccoORCiDGND
URN:urn:nbn:de:hebis:30:3-860232
URL:https://arxiv.org/abs/2311.17903v2
DOI:https://doi.org/10.48550/ARXIV.2311.17903
ArXiv Id:http://arxiv.org/abs/2311.17903
Parent Title (German):arXiv
Publisher:arXiv
Document Type:Preprint
Language:English
Date of Publication (online):2024/06/05
Date of first Publication:2024/06/05
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2024/07/01
Issue:2311.17903v2
Edition:Version 2
Page Number:28
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Sammlungen:Universitätspublikationen
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International