THEORETICAL C-RAY EMISSION STUDY OF HIGH-T-C SUPERCONDUCTOR YBA2CU3O7THIN-FILMS

The energy spectrum of YBa2Cu3O7 thin films is investigated by the fil m linearized augmented plane wave method (LAPW). On the basis of the r esults of the energy band structure calculation, theoretical calculati ons of X-ray emission spectra are performed. The calculated spectra ar e compared with the results of other calculations and experimental res earches. The reason of the observed systematic discrepancies in the fi ne structure is analysed. The obtained spectra confirm the resonance c haracter of the interaction of copper d-states with the nearest oxygen p-states.