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Effects of Cation Vacancies in the Phonon Raman Spectra of LaMnO 3
Author(s) -
Granado E.,
Sanjurjo J.A.,
Rettori C.,
Prado F.,
Sánchez R.D.,
Caneiro A.,
Oseroff S.B.
Publication year - 2000
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/1521-3951(200007)220:1<609::aid-pssb609>3.0.co;2-h
Subject(s) - raman spectroscopy , orthorhombic crystal system , crystallite , phonon , trigonal crystal system , materials science , manganese , condensed matter physics , spectral line , perovskite (structure) , manganite , crystallography , crystal structure , analytical chemistry (journal) , nuclear magnetic resonance , chemistry , physics , ferromagnetism , optics , chromatography , astronomy , metallurgy
Raman spectra of La 1– x Mn 1– x O 3 ( x = 0, 0.01, 0.017, 0.022, and 0.035) and La0.9 1– δ Mn 1– δ O 3 polycrystalline samples, taken at T = 10 K and room temperature, are presented. All La 1– x Mn 1– x O 3 samples show at T = 10 K the presence of modes at about 480 and 610 cm –1 , including the rhombohedral and quasi‐cubic orthorhombic samples. However, the Raman spectrum of the rhombohedral La 0.91– δ Mn 1– δ O 3 sample does not show these modes at T = 10 K, but presents weak and broad structures at T = 295 K. These results are discussed in terms of local structural distortions associated with Mn vacancies and/or carrier localization in manganese perovskites.