Uniaxial stress tuning of geometrical frustration in a Kondo lattice

Abstract

Hexagonal CeRhSn with paramagnetic $4f$ moments on a distorted Kagome lattice displays zero-field quantum critical behavior related to geometrical frustration. We report high-resolution thermal expansion and magnetostriction measurements under multiextreme conditions such as uniaxial stress up to 200 MPa, temperatures down to 0.1 K and magnetic fields up to 10 T. Under uniaxial stress along the $a$-direction, quantum criticality disappears and a complex magnetic phase diagram arises with a sequence of phases below 1.2 K and fields between 0 and 3 T ($\parallel a$). Since the Kondo coupling increases with stress, which alone would stabilize paramagnetic behavior in CeRhSn, the observed order arises from the release of geometrical frustration by in-plane stress.

Accepted in PRB Rapid Comm

References in corpus (10)

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• New applications for the world's smallest high-precision capacitance dilatometer and its stress-implementing counterpart
• Magnetic Kondo regimes in a frustrated half-filled trimer
• Quantitative investigation of the 4$f$ occupation in the quasikagome Kondo lattice CeRh${}_{1-x}$Pd${}_x$Sn
• Strong enhancement of magnetic coercivity induced by uniaxial stress
• Competing Interactions and the Effects of Uniaxial Out-of-plane Perturbations in the Honeycomb Antiferromagnet Na${}_2$Co${}_2$TeO${}_6$
• Antiferromagnetic Order and Magnetic Frustration in the Honeycomb Heavy-Fermion System Ce(Pt${}_{1-x}$Pd${}_x$)${}_6$Al${}_3$: ${}^{27}$Al and ${}^{195}$Pt NMR Studies
• Rotational Grüneisen ratio: a probe for quantum criticality in anisotropic systems