Regensburg 2025 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 58: f-Electron Systems and Heavy Fermions

TT 58.4: Talk

Friday, March 21, 2025, 12:15–12:30, H31

Emergent in-plane anisotropic elastoresistance in YbRh₂Si₂ — •Soumendra Nath Panja, Jacques Gounelle-Pontanel, Anton Jesche, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

We have shown recently that the Kondo interaction in the tetragonal heavy-fermion metal YbRh₂Si₂ can be efficiently tuned by tensile and compressive uniaxial strain along the [100] axis [1]. Here, we present a detailed investigation of the temperature dependent elastoresistance dρ/dє_i of YbRh₂Si₂, for both i=[100] and [110] directions. Remarkably, elastoresistance develops a pronounced in-plane strain anisotropy at low temperatures that is analyzed with respect to the influence of uniaxial strain on the crystal electric field splitting and Kondo interaction. Furthermore, we investigate the combined impact of magnetic field and strain on the low-temperature elastoresistance behavior in YbRh₂Si₂.

[1] S.N. Panja, A. Jesche, N. Tang, P. Gegenwart, Phys. Rev. B 109, 205152 (2024).

Keywords: Kondo effect; Strain; Pressure effects; Elastoresistance; YbRh2Si2