Phonon Raman study of the NdBa(2)Cu(3)Oy-Nd2Ba1Cu3Oy systemстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:We have investigated Raman-scattering spectra of Nd1+xBa2-xCu3Oy solid solutions with x = 0.0-0.9. For two compositions of x=0 and x=0.85, the Raman spectra were measured using detwinned or twinned single crystals. The observed spectra of Nd1.85Ba1.15Cu3Oz can be interpreted properly if an approximate structure with a doubled unit cell is assumed. Two x-dependent phase transitions in Nd1-xBa2-xCu3Oy solid solutions were analyzed by a joint study of Raman scattering and x-ray diffraction. The first transition at x approximate to 0.3 is connected mainly with disordering of oxygen atoms, while the second transformation at x approximate to 0.6 is induced by the Nd3+ and Ba2+ ions ordering in the structure. [S0163-1829(98)06141-4].