Optical Study of the Electronic Structure and Lattice Dynamics of NdBaMn₂O₆ Single Crystals.

ABSTRACT: We investigated the electronic structure and lattice dynamics of double perovskite NdBaMn₂O₆ single crystals through spectroscopic ellipsometry and Raman scattering spectroscopy. The optical absorption band centered at approximately 0.88 eV was assigned to on-site d-d transitions in Mn, whereas the optical feature at approximately 4.10 eV was assigned to charge-transfer transitions between the 2p state of O and 3d state of Mn. Analysis of the temperature dependence of the d-d transition indicated anomalies at 290 and 235 K. The activated phonon mode, which appeared at approximately 440 cm^-1 alongside with the enhancement of the 270 cm^-1 phonon mode, coupled strongly to the metal-insulator transition at 290 K, which was associated with a charge/or

SUBMITTER: Mero RD 

PROVIDER: S-EPMC6890712 | biostudies-literature | 2019 Dec

REPOSITORIES: biostudies-literature