Uniaxial stress tuning of geometrical frustration in a Kondo lattice

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...

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Bibliographic Details
Published in:Physical review. B 2017-12, Vol.96 (24), Article 241110
Main Authors: Küchler, R., Stingl, C., Tokiwa, Y., Kim, M. S., Takabatake, T., Gegenwart, P.
Format: Article
Language:English
Subjects:
Kagome lattice
Magnetostriction
Phase diagrams
Plane stress
Thermal expansion
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Summary: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 (∥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.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.96.241110