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arXiv · 2309.02559

Localized f-electron magnetism in the semimetal Ce3Bi4Au3

M. O. Ajeesh·S. K. Kushwaha·S. M. Thomas·J. D. Thompson·M. K. Chan·N. Harrison·J. M. Tomczak·P. F. S. Rosa
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Abstract

Ce$_{3}$Bi$_{4}$Au$_{3}$ crystallizes in the same non-centrosymmetric cubic structure as the prototypical Kondo insulator Ce$_{3}$Bi$_{4}$Pt$_{3}$. Here we report the physical properties of Ce$_{3}$Bi$_{4}$Au$_{3}$ single crystals using magnetization, thermodynamic, and electrical-transport measurements. Magnetic-susceptibility and heat-capacity data reveal antiferromagnetic (AFM) order below $T_N=3.2$ K. The magnetic entropy $S_{\rm mag}$ reaches $R$ln2 slightly above $T_N$, which suggests localized $4f$-moments in a doublet ground state. Multiple field-induced magnetic transitions are observed at temperatures below $T_N$, which indicate a complex spin structure with competing interactions. Ce$_{3}$Bi$_{4}$Au$_{3}$ shows semimetallic behavior in electrical resistivity measurements in contrast to the majority of reported Cerium-based 343 compounds. Electrical-resistivity measurements under hydrostatic pressure reveal a slight enhancement of $T_N$ under pressures up to 2.3 GPa, which supports a scenario wherein Ce$_{3}$Bi$_{4}$Au$_{3}$ belongs to the far left of the Doniach phase diagram dominated by Ruderman-Kittel-Kasuya-Yosida (RKKY) interactions. Using realistic many-body simulations, we confirm the semi-metallic electronic structure of Ce$_{3}$Bi$_{4}$Au$_{3}$ and quantitatively reproduce its local moment behavior in the paramagnetic state.

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M. O. Ajeesh, S. K. Kushwaha, S. M. Thomas, J. D. Thompson, M. K. Chan, N. Harrison, J. M. Tomczak, P. F. S. Rosa. 2023-09-05. Localized f-electron magnetism in the semimetal Ce3Bi4Au3. https://doi.org/10.1103/physrevb.108.245125

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