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TT: Fachverband Tiefe Temperaturen

TT 42: Poster: Correlated Electrons I

TT 42.4: Poster

Wednesday, March 29, 2023, 15:00–18:00, P2/OG2

Symmetry-broken low-temperature state in the Kondo system Ce₂Rh₂Ga — •Sajal Naduvile Thadathil^1,2, J Stirnat^1,2, P Devi¹, M Baenitz³, A Strydom⁴, D Soholov⁴, J Wosnitza^1,2, and T Helm¹ — ¹Dresden High Magnetic Field Laboratory (HLD-EMFL), HZDR, Germany — ²Institute of Solid State and Materials Physics, TU Dresden, Germany — ³Max Planck Institute for Chemical Physics of Solid, Dresden, Germany — ⁴University of Johannesburg, South Africa

Cerium-based heavy-fermion conductors often exhibit unconventional transport and thermodynamic properties related to 4f-electron physics. Ce₂Rh₂Ga exhibits a structural phase transition around T_p≈ 130 K from an orthorhombic to monoclinic crystal structure accompanied by an extreme anisotropy in its electrical conduction. Recent nuclear quadrupole resonance studies on polycrystals found evidence for the emergence of two inequivalent Ce ions below 2 K with different electronic environments that may provide grounds for multi-ion Kondo physics [1]. Here, we present results from magnetotransport studies on micron-sized devices cut from single crystals. We investigated the anisotropy between 0.3 and 300 K in fields up to 16 T. Below 5 K, the angular dependence of the magnetoresistance exhibits a significant change in its rotational anisotropy, indicating a broken symmetry. These findings may provide further evidence for multi-ion Kondo physics in Ce₂Rh₂Ga.
[1] Sh. Yamamoto et al., Phys. Rev. B 106, 115125 (2022)