S. A. Klimin, M. S. Radionov, V. A. Yakovlev, N. N. Novikova, A. V. Peschanskii, “Ir active phonons of a LiNiPO<nobr>$_{4}$</nobr> ionic crystal”, Optics and Spectroscopy, 2021, Volume 129, Issue 1,Pages <nobr>46

This article is cited in 4 papers

Spectroscopy of condensed matter

Ir active phonons of a LiNiPO$_{4}$ ionic crystal

S. A. Klimin^a, M. S. Radionov^ab, V. A. Yakovlev^a, N. N. Novikova^a, A. V. Peschanskii^c

^a Institute of Spectroscopy, Russian Academy of Sciences, Troitsk, Moscow
^b Moscow Institute of Physics and Technology (National Research University), Dolgoprudny, Moscow Region
^c B. Verkin Institute for Low Temperature Physics and Engineering, National Academy of Sciences of Ukraine, Khar'kov

Abstract: The results of an experimental study of the phonon spectrum of a LiNiPO$_{4}$ single crystal by infrared (IR) reflection spectroscopy are presented. Spectroscopic parameters of phonons active in IR spectra are obtained. The observed number of phonons is generally in agreement with the performed group-theoretical analysis. The reasons for small discrepancies are discussed. With decreasing temperature, a hardening of phonon frequencies is observed, which is associated with temperature changes in the parameters of the crystal lattice.

Keywords: phonons, LiNiPO$_{4}$ single crystal, IR reflection.

Received: 21.09.2020
Revised: 21.09.2020
Accepted: 05.10.2020

DOI: 10.21883/OS.2021.01.50438.249-20