Abstract
Phonon modes of the colossal magnetoresistance manganites La0.7Ca0.3MnO3 and La0.8Li0.2MnO3 have been investigated by far-infrared (100–700 cm−1) reflectivity spectroscopy at elevated temperatures (300–800 K). The three principal optical phonons all move systematically to lower frequency as temperature increases, in accordance with a Gruneisen relationship. The La(Ca,Li)–(MnO3) vibration (∼170 cm−1) varies with cation mass as expected. The Mn–O stretching mode (∼580 cm−1) has a higher frequency in the Li-doped compound than in the Ca-doped, whereas the O–Mn–O bending mode )∼340 cm−1) occurs at the same frequency in each, demonstrating that the cation strongly influences the Mn–O– length but not the bond angle.
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