Superconductivity

Thermal stability of YBa$_2$Cu$_3$O$_{7-\delta}$, films deposited on Ni–W textured substrates by laser ablation

S. G. Titova^a, L. A. Cherepanova^a, Yu. V. Blinova^b, S. V. Sudareva^b, M. V. Degtyarev^b, E. I. Kuznetsova^b, O. V. Snigirev^c, N. V. Porokhov<sup>c

a</sup> Institute of Metallurgy, Ural Division of the Russian Academy of Sciences, Yekaterinburg
^b Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg
^c Lomonosov Moscow State University

Abstract: The degradation processes of YBa$_2$Cu$_3$O$_{6.77(3)}$ films 600 nm thick deposited on substrates from a textured (100) foil of the Ni–W alloy with the YSZ (Y$_2$O$_3$+ZrO$_2$) (100 nm) and CeO$_2$ (50 nm) buffer layers at 200$^\circ$C in air have been investigated. It has been shown that the degradation proceeds in the same manner as in the bulk ceramic materials with the same oxygen content, namely, initially the single-phase material with the orthorhombic structure laminates into the fractions depleted (the main fraction) and enriched with oxygen. After holding for more than 20 h, the oxygen-depleted fraction is first subjected to the structural phase transformation with the transition of the orthorhombic structure into the cubic one, which is associated with the redistribution of barium and yttrium atoms over their sites in the presence of water vapors.

Received: 07.02.2013

 English version: Physics of the Solid State, 2013, 55:8, 1609–1612

Bibliographic databases:

•