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Structural 130 K phase transition and emergence of a two-ion Kondo state in Ce2Rh2Ga explored by Ga69,71 nuclear quadrupole resonance

Sh. Yamamoto, T. Fujii, S. Luther, H. Yasuoka, H. Sakai, F. Bärtl, K. M. Ranjith, H. Rosner, J. Wosnitza, A. M. Strydom, H. Kühne, and M. Baenitz
Phys. Rev. B 106, 115125 – Published 14 September 2022

Abstract

We have studied the microscopic magnetic properties, the nature of the 130 K phase transition, and the ground state in the recently synthesized compound Ce2Rh2Ga by use of 69,71Ga nuclear quadrupole resonance (NQR). The NQR spectra clearly show an unusual phase transition at Tt130 K, yielding a splitting of the high-temperature single NQR line into two well-resolved NQR lines, providing evidence for two crystallographically inequivalent Ga sites. The NQR frequencies are in good agreement with fully relativistic calculations of the band structure. Our NQR results indicate the absence of magnetic or charge order down to 0.3 K. The temperature dependence of the spin-lattice relaxation rate 1/T1 shows three distinct regimes, with onset temperatures at Tt and 2 K. The temperature-independent 1/T1, observed between Tt and 2 K, crosses over to a Korringa process, 1/T1T, below 2 K, which evidences a rare two-ion Kondo scenario: The system evolves into a dense Kondo coherent state below 2.0 and 0.8 K probed by the two different Ga sites.

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  • Received 13 May 2022
  • Revised 26 August 2022
  • Accepted 26 August 2022

DOI:https://doi.org/10.1103/PhysRevB.106.115125

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. Open access publication funded by the Max Planck Society.

Published by the American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Sh. Yamamoto1,2,*, T. Fujii2, S. Luther1,3, H. Yasuoka2, H. Sakai4, F. Bärtl1,3, K. M. Ranjith2, H. Rosner2, J. Wosnitza1,3, A. M. Strydom2,5, H. Kühne1, and M. Baenitz2

  • 1Hochfeld-Magnetlabor Dresden (HLD-EMFL) and Würzburg-Dresden Cluster of Excellence ct.qmat, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 2Max Planck Institute for Chemical Physics of Solids, D-01187 Dresden, Germany
  • 3Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany
  • 4Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
  • 5Highly Correlated Matter Research Group, Physics Department, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa

  • *s.yamamoto@hzdr.de

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Issue

Vol. 106, Iss. 11 — 15 September 2022

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