Inelastic neutron-scattering study of the phonon spectrum of Bi2Sr2CaCu2O8-based Nd-containing solid solutionsстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:A study of the phonon spectra of Bi2Sr2Ca1- xNdxCu2Odelta solid solutions (x = 0.1, 0.25, 0.75) by inelastic neutron scattering on a DIN-2PI forward-scattering spectrometer is reported. As the Nd content increases, the frequency of the Cu-O stretching vibrational modes increases (by about 70 meV), an effect caused by a change in carrier concentration in the CuO2 sheet and not depending on the "internal pressure." An analysis of the displacement of the peak near 11 meV (assigned to cation vibrations in the SrO sheet of the Bi2Sr2CaCu2O8 structure) suggests that a sizable part of the Nd atoms occupy Sr positions. (C) 2000 MAIK "Nauka/ Interperiodica".