Phonon anomalies near the magnetostructural transition in Li2RuO3: Raman spectroscopy and density functional theory studies

Yuri S. Ponosov, Evgenia V. Komleva, and Sergey V. Streltsov
Phys. Rev. B 100, 134310 – Published 21 October 2019

Abstract

Raman spectroscopy is used to control the kinetics of the magnetostructural transition in Li2RuO3 crystals from the low-temperature dimerized phase (P21/m) to the high-temperature phase (C2/m) at Tc550 K accompanied by the destruction of the spin singlets on the Ru-Ru bonds. The theoretical group analysis and the results of the density functional theory calculations of the lattice dynamics were used to identify phonon modes that are sensitive to the transition. The observed anomalies in the behavior of the self-energies of such phonons near Tc suggest their connection either with possible dynamic disordering of Ru atomic positions or with spin-phonon interaction.

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  • Received 1 August 2019
  • Revised 17 September 2019

DOI:https://doi.org/10.1103/PhysRevB.100.134310

©2019 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Yuri S. Ponosov1,2, Evgenia V. Komleva1, and Sergey V. Streltsov1,2

  • 1M.N. Mikheev Institute of Metal Physics, S. Kovalevskaya Street 18, 620137 Ekaterinburg, Russia
  • 2Ural Federal University, Mira Street 19, 620002 Ekaterinburg, Russia

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Issue

Vol. 100, Iss. 13 — 1 October 2019

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