Far infrared properties of the rare-earth scandate DyScO3

TL;DR

This study investigates the infrared-active phonons and terahertz optical properties of DyScO3 single crystals through experimental measurements and computational comparison, providing new data for optical analysis.

Contribution

It presents the first experimental investigation of infrared-active phonons in DyScO3 and compares them with ab-initio calculations, also detailing its terahertz refractive index.

Findings

Identified infrared-active phonon frequencies and their temperature dependence.

Compared experimental phonon data with ab-initio calculations.

Provided detailed terahertz refractive index data for DyScO3.

Abstract

We present reflectance measurements in the infrared region on a single crystal the rare earth scandate DyScO3. Measurements performed between room temperature and 10 K allow to determine the frequency of the infrared-active phonons, never investigated experimentally, and to get information on their temperature dependence. A comparison with the phonon peak frequency resulting from ab-initio computations is also provided. We finally report detailed data on the frequency dependence of the complex refractive index of DyScO3 in the terahertz region, which is important in the analysis of terahertz measurements on thin films deposited on DyScO3.