Regensburg 2025 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 15: Poster I

MA 15.32: Poster

Dienstag, 18. März 2025, 10:00–12:30, P1

Geometrical frustration mediated unconventional magnetism in a Kondo lattice Ce3ZrBi5 — •Saswata Halder, Arumugam Thamizhavel, and Kalobaran Maiti — Tata Institute of Fundamental Physics, Mumbai, India

Kondo lattice materials with geometric frustration offer fertile ground for exploring exotic new physics with a field-induced fractional magnetization platform. In this work, we investigate hexagonal Ce3ZrBi5 with 1D Bi chains and a frustrated Ce-kagome network to understand its magnetic properties. Density functional theory (DFT) calculations reveal the presence of a non-trivial electronic structure, that changes significantly in the presence of SOC. The temperature dependent magnetization for Ce3ZrBi5 show the presence of two antiferromagnetic (AFM) transitions below TN = 4.9 K; highlighting a complex and highly anisotropic magnetic landscape. The magnetization shows a peculiar nature where the moments align along the CEF hard axis; contrary to conventional antiferromagnets. The unconventional magnetization can be attributed to multiple observables: geometric frustration, presence of competing Kondo and RKKY nergy scales and strong spin- orbit coupling (SOC). Field-induced metamagnetic transitions are observed in the isothermal magnetization data which follows the one-third magnetization rule observed in frustrated Kagome lattices. Specific heat and transport measurements highlight inherent Kondo-lattice characteristics in Ce3ZrBi5. Our work establishes Ce3ZrBi5 and related materials as a unique platform for exploring low-dimensional quantum fluctuations in frustrated antiferromagnets.

Keywords: Geometrical frustration; Kondo physics; Heavy fermions; Antiferromagnets; Topology