YBaCuO superconducting films with Tc=90 K grown off-1:2:3 composition in low oxygen pressure
- 1 January 1991
- journal article
- Published by IOP Publishing in Superconductor Science and Technology
- Vol. 4 (1S) , S376-S378
- https://doi.org/10.1088/0953-2048/4/1s/111
Abstract
YBaCuO films were grown in-situ by reactive coevaporation at low oxygen pressures. Films made at lower pressures (1-10 mTorr) and in non-equilibrium conditions have a c-axis lattice constant (cO) which is expanded compared to the films made at higher pressures (>100 mTorr). The authors have also found that at lower oxygen pressure off-1:2:3-composition and Ba-deficient films have higher Tc's (88-90 K) and lower cO than do films on-1:2:3 stoichiometry. They suggest that metal-atom point-like defects are quenched into the films at lower oxygen growth pressures.Keywords
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