Terahertz-infrared spectra of the rare-earth scandate DyScO3 single crystal

Abstract

Terahertz and infrared spectra of the optical response of DyScO3 single crystal are measured at temperatures from 5 K to 300 K for two different polarizations E‖[1¯01] and E‖[010], i.e., along the two crystallographic directions of the DyScO3 substrates used for growing of thin films and heterostructures. Detailed reference data on the terahertz dielectric characteristics of the DyScO3 substrate are presented. We discuss the mechanisms responsible for electromagnetic absorption. Phonon spectra are analyzed along with the results of group-theoretical analysis of the crystal structure. Besides phonon modes, additional resonance absorptions are found and assigned to the electronic transitions between Kramers doublets in the three lowest-energy terms of the Dy3+ ion.

Temperature-dependent far-infrared reflectance of an epitaxial (BaTiO3)8/(SrTiO3)4 superlattice

“…The substrate spectra show the expected typical phonon characteristics. They are similar to the spectra obtained by other authors [39][40][41] , where further details about them can be found. All 7 modes predicted by the group analysis can be observed along the c-axis while only 14 modes are found in the direction perpendicular to it.…”

Infrared spectroscopy of an epitaxial BaTiO3/SrTiO3 superlattice grown on a (110) SmScO3 substrate

“…Similar effect was observed also in other scandates. [18][19][20] It is not quite clear what is nature of this effect, because no structural changes in this temperature range are observed. The reflection in this spectral region is very strong and makes difficult to study infrared properties of any film or superlattice deposited on its top in this polarization.…”

Absorption spectra of single-crystal and optical ceramics of fluorite in terahertz and infrared ranges

“…Измерения выполнены на инфракрасном фурьеспектрометре "Bruker IFS-113v" (IR FT) и лабораторном импульсном спектрометре терагерцового диапазона с временным разрешением (TDS), описанном в [7]. Методика аналогична использованной в работе [8].…”