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TT: Fachverband Tiefe Temperaturen

TT 52: Heavy Fermions

TT 52.6: Vortrag

Mittwoch, 11. März 2026, 16:15–16:30, HSZ/0103

Coupling between Kondo effect and in-plane strain in YbRh₂Si₂ — •Soumendra Nath Panja, Jacques G Pontanel, Julian Kaiser, Anton Jesche, and Philipp Gegenwart — Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany

We study symmetry-resolved elastoresistance in the tetragonal Kondo lattice YbRh₂Si₂ down to 2 K and in fields up to 14 T. By measuring longitudinal and transverse electrical transport response under applied in-plane uniaxial strain along [100] and [110], we extract the A_1g, B_1g, and B_2g elastoresistive responses. This is complemented by high-resolution in-plane thermal-expansion measurements utilizing a novel sample-mounting strategy for thin crystals in the capacitive dilatometer. Our results establish a thermodynamic link to the strain-dependent electronic behavior and highlight how Kondo hybridization couples to in-plane strain in this heavy-fermion system.

Keywords: heavy-fermion systems; Kondo effect; Elastoresistance; Uniaxial strain; Dilatometry