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Raman phonons in La 2−2 x Sr 1+2 x Mn 2 O 7 layered manganites
Author(s) -
Guedes I.,
Mitchell J. F.,
Argyriou D.,
Grimsditch M.
Publication year - 2000
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/1097-4555(200011)31:11<1013::aid-jrs637>3.0.co;2-9
Subject(s) - raman spectroscopy , manganite , tetragonal crystal system , phonon , crystallite , dopant , materials science , doping , condensed matter physics , ceramic , crystal structure , mineralogy , analytical chemistry (journal) , crystallography , chemistry , optics , physics , ferromagnetism , optoelectronics , composite material , chromatography
Phonons of polycrystalline La 2−2 x Sr 1+2 x Mn 2 O 7 (0.38 ≤ x ≤ 1.0) ceramic samples were studied at room temperature using Raman spectroscopy. The spectra are consistent with the group theory predictions for a body‐centered tetragonal crystal structure $(D_{4h}^{17})$ . Since no appreciable changes were observed in the Raman spectra for different extents of La doping, this suggests that the layered manganite structure is less sensitive to dopants than that of the related three‐dimensional perovskites. Copyright © 2000 John Wiley & Sons, Ltd.