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  • Letter
  • Open Access

Divergent thermal expansion and Grüneisen ratio in a quadrupolar Kondo metal

A. Wörl1,*, M. Garst2,3, Y. Yamane4,†, S. Bachus1, T. Onimaru4, and P. Gegenwart1,‡

  • 1Experimental Physics VI, Center for Electronic Correlations and Magnetism, University of Augsburg, 86159 Augsburg, Germany
  • 2Institute for Theoretical Solid State Physics, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 3Institute for Quantum Materials and Technology, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
  • 4Department of Quantum Matter, Graduate School of Advanced Science and Engineering, Hiroshima University, Higashi-Hiroshima 739-8530, Japan

  • *andreas.woerl@physik.uni-augsburg.de
  • †Present address: Department of Material Science, Graduate School of Science, University of Hyogo, Kamigori, Hyogo 678-1297, Japan.
  • ‡philipp.gegenwart@physik.uni-augsburg.de
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Phys. Rev. Research 4, L022053 – Published 6 June, 2022

DOI: https://doi.org/10.1103/PhysRevResearch.4.L022053

Abstract

We report on the low-temperature thermal expansion and magnetostriction of the single-impurity quadrupolar Kondo candidate Y1−xPrxIr2Zn20. In the dilute limit, we find a quadrupolar strain that possesses a singular dependence on temperature T, ɛu∼H2log(1/T), for a small but finite magnetic field H. Together with the previously reported anomalous specific heat C, this implies a quadrupolar Grüneisen ratio Γu=∂Tɛu/C∼H2/[T2log(1/T)] whose divergence for finite H is consistent with the scenario of a quadrupolar Kondo effect. In addition, we find a singular behavior of the isotropic strain ɛB 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.

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References (31)

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Phys. Rev. Research 4, L022053– Published 6 June, 2022
  • Received 28 July 2021
  • Revised 21 April 2022
  • Accepted 26 April 2022
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