Engineering Physics Annotation << Back NUCLEAR QUADRUPOLE INTERACTION AND EFFECTIVE CHARGES OF ATOMS IN YBa2Cu3O7-x AND La2-xSrxCuO4 CRYSTALS V.A. DORONIN, A.V. MARCHENKO It was demonstrated that the parameters of the Mössbauer spectra on 57Co(57mFe), 67Cu(67Zn), 67Ga(67Zn), 155Eu(155Gd) isotopes, 17O, 137Ba nuclear magnetic resonance data and calculations of the lattice electric field gradient for all YBa2Cu3O7–x crystal lattice sites and La2−xSrxCuO4 correspond to the model when the hole arising due to the nonstoichiometry of an YBa2Cu3O7–x crystal or the alternatively replacing La3+ by Sr2+ in La2−xSrxCuO4 , is located mainly in the sublattice of the chain (in YBa2Cu3O7–x), or planar (in La2−xSrxCuO4) oxygen. Key words: nuclear quadrupole interaction parameters, Mossbauer spectroscopy, nuclear magnetic resonance, high-temperature superconductors. DOI: 10.25791/infizik.10.2019.917 Contacts: - Pp. 30-35.