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Fast mapping of inhomogeneities in the popular metallic perovskite Nb:SrTiO 3 by confocal Raman microscopy
Author(s) -
Rodenbücher Christian,
Jauß Andrea,
Havel Viktor,
Waser Rainer,
Szot Kristof
Publication year - 2014
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201409221
Subject(s) - raman spectroscopy , homogeneity (statistics) , confocal , materials science , microscopy , doping , confocal microscopy , crystal (programming language) , perovskite (structure) , analytical chemistry (journal) , optics , crystallography , chemistry , optoelectronics , physics , programming language , statistics , mathematics , chromatography , computer science
Confocal Raman microscopy was applied in order to investigate the homogeneity of donor doping in Nb:SrTiO 3 single crystals. Measurements of local Raman spectra revealed a systematic relation between the intensity of the Raman signal and the donor content of the crystals. We successfully elaborated a correspondence between the electronic structure and the intensity of the Raman lines using a crystal with macroscopic inhomogeneity as a demonstration sample. By mapping the distribution of the intensity of the Raman signal, we identified a characteristic inhomogeneous structure related to the presence of clusters with sizes of 5 µm to 20 µm, indicating inhomogeneous donor distribution caused by flaws introduced during crystal growth. Hence, we propose confocal Raman microscopy as a convenient technique for investigating the homogeneity and quality of doped perovskite surfaces, which are needed for various technological applications. (© 2014 WILEY‐VCH Verlag GmbH &Co. KGaA, Weinheim)