Ce$_3$Bi$_4$Ni$_3$ $-$ A large hybridization-gap variant of Ce$_3$Bi$_4$Pt$_3$
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2023
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| author | Kirschbaum, D. M. Yan, X. Waas, M. Svagera, R. Prokofiev, A. Stöger, B. Giester, G. Rogl, P. Oprea, D. -G. Felser, C. Valentí, R. Vergniory, M. G. Custers, J. Paschen, S. Zocco, D. A. |
| author_facet | Kirschbaum, D. M. Yan, X. Waas, M. Svagera, R. Prokofiev, A. Stöger, B. Giester, G. Rogl, P. Oprea, D. -G. Felser, C. Valentí, R. Vergniory, M. G. Custers, J. Paschen, S. Zocco, D. A. |
| contents | 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, Ce$_3$Bi$_4$Ni$_3$. It is an isoelectronic analog of the prototypical Kondo insulator Ce$_3$Bi$_4$Pt$_3$ and of the recently discovered Weyl-Kondo semimetal Ce$_3$Bi$_4$Pd$_3$. In contrast to the volume-preserving Pt-Pd substitution, structural and chemical analyses reveal a positive chemical pressure effect in Ce$_3$Bi$_4$Ni$_3$ 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 Ce$_3$Bi$_4$Pt$_3$ and about 45 times larger than that of the Kondo-insulating background hosting the Weyl nodes in Ce$_3$Bi$_4$Pd$_3$. We show that this gap as well as other physical properties do not evolve monotonically with increasing atomic number, i.e., in the sequence Ce$_3$Bi$_4$Ni$_3$-Ce$_3$Bi$_4$Pd$_3$-Ce$_3$Bi$_4$Pt$_3$, 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_17903 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Ce$_3$Bi$_4$Ni$_3$ $-$ A large hybridization-gap variant of Ce$_3$Bi$_4$Pt$_3$ Kirschbaum, D. M. Yan, X. Waas, M. Svagera, R. Prokofiev, A. Stöger, B. Giester, G. Rogl, P. Oprea, D. -G. Felser, C. Valentí, R. Vergniory, M. G. Custers, J. Paschen, S. Zocco, D. A. Strongly Correlated Electrons 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, Ce$_3$Bi$_4$Ni$_3$. It is an isoelectronic analog of the prototypical Kondo insulator Ce$_3$Bi$_4$Pt$_3$ and of the recently discovered Weyl-Kondo semimetal Ce$_3$Bi$_4$Pd$_3$. In contrast to the volume-preserving Pt-Pd substitution, structural and chemical analyses reveal a positive chemical pressure effect in Ce$_3$Bi$_4$Ni$_3$ 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 Ce$_3$Bi$_4$Pt$_3$ and about 45 times larger than that of the Kondo-insulating background hosting the Weyl nodes in Ce$_3$Bi$_4$Pd$_3$. We show that this gap as well as other physical properties do not evolve monotonically with increasing atomic number, i.e., in the sequence Ce$_3$Bi$_4$Ni$_3$-Ce$_3$Bi$_4$Pd$_3$-Ce$_3$Bi$_4$Pt$_3$, 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. |
| title | Ce$_3$Bi$_4$Ni$_3$ $-$ A large hybridization-gap variant of Ce$_3$Bi$_4$Pt$_3$ |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2311.17903 |