Abstract
Phonons of polycrystalline La2-2xSr1+2xMn2O7 (0.38 less than or equal to
x less than or equal to 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 (C) 2000 John Wiley
& Sons, Ltd.
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