Articles you may be interested inHigh-temperature transport properties of Ca 0.98 RE 0.02 MnO 3 − δ ( RE = Sm , Gd, and Dy) Appl. Phys. Lett. 98, 214101 (2011);High room temperature ferromagnetic moment of Ho substituted nanocrystalline BiFeO 3Infrared transmission spectra were measured systematically in polycrystalline La 1Ϫx Ca x MnO 3Ϫ␦ and several systems substituted by other rare earth ͑RE͒ ions such as Sm 3ϩ , Gd 3ϩ , Dy 3ϩ , etc., at La 3ϩ sites or Fe ions at Mn sites but keeping the nominal Mn 4ϩ /Mn 3ϩ Ϸ3/7. Two strong absorption peaks located around 600 and 350 cm Ϫ1 , which are associated with internal phonon modes, i.e., stretching and bending modes of MnO 6 octahedra, have been observed. Both of them are influenced by the concentrations of Ca and other RE ions substituting at the La and Mn sites. The details of the absorption peaks will be discussed on the basis of changes of the bond length of Mn-O and bond angle of Mn-O-Mn in MnO 6 octahedra.
Raman scattering from InAs nanocrystals embedded in SiO2 thin films has been measured and studied. Raman spectra of InAs nanocrystals have a similar feature with that of bulk InAs crystal. Broadened and red-shifted Raman scattering peaks were observed from the nanocrystals; this has been attributed to the phonon confinement effect. A compressive stress in the interface between InAs nanocrystals and the SiO2 matrix was also taken into account to interpret the red shift.
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