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X-ray photoelectron spectra and composition of YBa2Cu3O7 − δ films prepared by laser ablation

  • Superconductivity
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Abstract

The Y3d, Ba3d 5/2, Cu2p 3/2, and O1s X-ray photoelectron spectra of thick (600 nm) superconducting YBa2Cu3O7 − δ films deposited on textured Ni-W substrates with Y2O3 + ZrO2 and CeO2 buffer layers have been studied. It has been established that, after the mechanical removal of surface layers with a diamond scraper (and as the analyzed region of the film approaches the interface), a decrease in the oxygen content leads to a decrease of the orthophase fraction and an increase of the tetraphase and Cu+ ion fractions. This is caused by the presence of elastic stresses in the superconducting film due to the lattice misfit between the phases making up a composite sample. These stresses prevent oxygen diffusion involved in oxidizing annealing. The spectra of the superconducting film have not revealed signals generated by elements of the substrate and buffer layers.

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Correspondence to S. V. Sudareva.

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Original Russian Text © Yu.V. Blinova, M.V. Kuznetsov, V.R. Galakhov, S.V. Sudareva, T.P. Krinitsina, E.I. Kuznetsova, M.V. Degtyarev, O.V. Snigirev, N.V. Porokhov, 2014, published in Fizika Tverdogo Tela, 2014, Vol. 56, No. 4, pp. 634–640.

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Blinova, Y.V., Kuznetsov, M.V., Galakhov, V.R. et al. X-ray photoelectron spectra and composition of YBa2Cu3O7 − δ films prepared by laser ablation. Phys. Solid State 56, 659–665 (2014). https://doi.org/10.1134/S1063783414040040

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