Fast mapping of inhomogeneities in the popular metallic perovskite Nb:SrTiO3 by confocal Raman microscopy |
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Authors: | Christian Rodenbücher Andrea Jauß Viktor Havel Rainer Waser Kristof Szot |
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Institution: | 1. Forschungszentrum Jülich GmbH, Peter Grünberg Institut (PGI‐7), , 52425 Jülich, Germany;2. WITec GmbH, , 89081 Ulm, Germany;3. RWTH Aachen, , 52056 Aachen, Germany;4. University of Silesia, , 40‐007 Katowice, Poland |
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Abstract: | Confocal Raman microscopy was applied in order to investigate the homogeneity of donor doping in Nb:SrTiO3 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) |
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Keywords: | donor doping confocal Raman microscopy lattice vibrations inhomogeneities perovskites SrTiO3 |
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