Japanese Journal of Applied Physics · 1987 · 43 citations · 7 references
Natural SciencesChemistryMaterials ScienceMaterials CharacterizationSpectroscopic AnalysisSpectroscopyAbsorption SpectroscopyInfrared SpectroscopyInorganic SpectroscopyOptical Properties Of MaterialsOptical Properties Of SolidsOptical SpectroscopyInfrared Absorption SpectraInfrared Absorption SpectroscopyInfrared Reflection-absorption SpectroscopyInfrared SpectraInfrared Transmission PropertiesSofteningTemperature Dependence Of Absorption SpectraVibrational Absorption Bands
Reflectivity and transmission spectra of (La 1- x Sr x ) 2 CuO 4 were measured in the spectral range of 20-4800 cm -1 . The intensity of the absorption peak around 255 cm -1 became twice with lowering temperature from 298 to 19 K accompanying weak softening, while the Cu-O asymmetric stretching mode at 510 cm -1 was almost unchanged both in its energy and intensity. The origin of the soft-phonon mode is discussed.
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High T<sub>c</sub>Superconductivity of La-Ba-Cu Oxides
Shin‐ichi Uchida, H. Takagi, K. Kitazawa et al. · Japanese Journal of Applied Physics · 1987 · 490 citations