Abstract
We report on the low-temperature thermal expansion and magnetostriction of the single-impurity quadrupolar Kondo candidate . In the dilute limit, we find a quadrupolar strain that possesses a singular dependence on temperature , for a small but finite magnetic field . Together with the previously reported anomalous specific heat , this implies a quadrupolar Grüneisen ratio whose divergence for finite is consistent with the scenario of a quadrupolar Kondo effect. In addition, we find a singular behavior of the isotropic strain in zero magnetic field resulting in a divergence of both the volume thermal expansion and the volume Grüneisen parameter. We speculate that this behavior might be also induced by putative Kondo correlations via elastic anharmonicities or static strain disorder.
- Received 28 July 2021
- Revised 21 April 2022
- Accepted 26 April 2022
DOI:https://doi.org/10.1103/PhysRevResearch.4.L022053
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
Published by the American Physical Society