Magnetoelastic coupling across the field-induced transition of uranium mononitride

D. I. Gorbunov, T. Nomura, A. A. Zvyagin, M. S. Henriques, A. V. Andreev, Y. Skourski, G. A. Zvyagina, R. Troć, S. Zherlitsyn, and J. Wosnitza
Phys. Rev. B 100, 024417 – Published 15 July 2019

Abstract

Uranium mononitride (UN) displays a spin-flop-like transition for magnetic field applied along all principal crystallographic directions just below 60 T. Here, we report on ultrasound and magnetocaloric-effect results for UN in pulsed magnetic fields up to 65 T. The field-induced phase transition causes a discontinuous temperature decrease, indicating a larger magnetic entropy above the transition. Furthermore, we find pronounced anomalies in the acoustic properties, which signals strong spin-lattice interactions. A further anomaly observed at fields slightly above the transition is likely related to the formation of magnetic domains. A model based on the exchange-striction coupling mechanism well reproduces the strong renormalization of the acoustic properties.

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  • Received 18 February 2019
  • Revised 14 June 2019

DOI:https://doi.org/10.1103/PhysRevB.100.024417

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

D. I. Gorbunov1, T. Nomura1, A. A. Zvyagin2,3,4, M. S. Henriques5, A. V. Andreev5, Y. Skourski1, G. A. Zvyagina3, R. Troć6,*, S. Zherlitsyn1, and J. Wosnitza1,7

  • 1Hochfeld-Magnetlabor Dresden (HLD-EMFL), Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
  • 2Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
  • 3B. I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkiv 61103, Ukraine
  • 4V. N. Karazin Kharkiv National University, 4, Svoboda Square Kharkiv 61022, Ukraine
  • 5Institute of Physics, Academy of Sciences, Na Slovance 2, 182 21 Prague, Czech Republic
  • 6W. Trzebiatowski Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Okólna 2, 50-422 Wrocław, Poland
  • 7Institut für Festkörper- und Materialphysik, TU Dresden, 01062 Dresden, Germany

  • *Deceased.

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Vol. 100, Iss. 2 — 1 July 2019

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