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arXiv · 2605.28540

Anisotropic magnetism and Kondo-lattice behavior in the frustrated antiferromagnet Ce3MgBi5

Karolina Gornicka·Brenden R. Ortiz·Matthew S. Cook·Heda Zhang·Andrew D. Christianson·Andrew F. May
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Abstract

We report the synthesis and physical characterization of single-crystalline Ce3MgBi5, a previously unexplored member of the Ce3MPn5 family. This compound crystallizes in the hexagonal P63/mcm structure, featuring an anisotropic Ce sublattice composed of zig-zag chains along the c axis and a distorted kagome-like network in the basal plane. Magnetization measurements reveal antiferromagnetic order below TN approximately 4.2 K, accompanied by strong magnetic anisotropy and multiple field-induced metamagnetic transitions for fields applied perpendicular to [001], leading to a dome-shaped H-T phase diagram. Electrical transport exhibits characteristic signatures of a Ce-based Kondo lattice, including broad resistivity maxima and pronounced field-dependent anomalies in the magnetoresistance and Hall response that track the magnetic phase boundaries. Specific-heat measurements confirm the magnetic transition and show that the full R ln 2 entropy expected for a Ce3+ Kramers doublet is recovered by 20 K, indicating an extended temperature range of magnetic fluctuations consistent with Kondo correlations. Our results establish Ce3MgBi5 as a platform within the Ce3MPn5 family for exploring the interplay of geometric frustration, magnetic anisotropy, and Kondo-lattice physics under applied magnetic fields.

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Karolina Gornicka, Brenden R. Ortiz, Matthew S. Cook, Heda Zhang, Andrew D. Christianson, Andrew F. May. 2026-05-27. Anisotropic magnetism and Kondo-lattice behavior in the frustrated antiferromagnet Ce3MgBi5. https://doi.org/10.1103/g79p-6c1d

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