PARTIAL VIBRATION-SPECTRA OF CU, LA AND O ATOMS IN LA2CUO4

By using the experimental results obtained by the isotopic contrast me thod in neutron inelastic scattering, and by using the data of calcula tion on the shell model of force interaction, the partial vibrational spectra of Cu, La and O in the La2CuO4 lattice are reestablished and t he phonon spectrum of the system is reconstructed. The temperature dep endences of the mean square thermal displacements of various atoms and the specific heat of the compound are calculated. The data obtained a re compared with the results of theoretical calculations and independe nt experiments.