Title :
Ba/sub 1-x/K/sub x/BiO/sub 3/ epitaxy on various substrate materials
Author :
Utz, B. ; Wiest, F. ; Prusseit, W. ; Berberich, P. ; Kinder, H.
Author_Institution :
Dept. of Phys., Tech. Univ. Munchen, Germany
fDate :
6/1/1995 12:00:00 AM
Abstract :
We have fabricated Ba/sub 1-x/K/sub x/BiO/sub 3/ (BKBO) films by thermal co-evaporation of the metals K, Ba and Bi. To improve the epitaxy a high temperature BaBiO/sub 3/ seed layer is deposited prior to the BKBO film which results in T/sub c/ values up to 24 K on standard substrates. As BKBO grows well on perovskites we deposited thin PrBa/sub 2/Cu/sub 3/O/sub 7/ (PBCO) layers by thermal co-evaporation on MgO, CeO/sub 2/ buffered sapphire, YSZ buffered Si and YSZ substrates. BKBO films on these systems are epitaxial and show the same T/sub c/ values as on standard substrates. Thus, by using a PBCO buffer layer technical substrates are available for BKBO thin films.<>
Keywords :
barium compounds; high-temperature superconductors; potassium compounds; superconducting epitaxial layers; superconducting transition temperature; vapour phase epitaxial growth; (BaK)BiO/sub 3/; 24 K; Ba/sub 1-x/K/sub x/BiO/sub 3/ epitaxy; Ba/sub 1-x/K/sub x/BiO/sub 3/ films; CeO/sub 2/ buffered sapphire; CeO/sub 2/-Al/sub 2/O/sub 3/; MgO; PrBa/sub 2/Cu/sub 3/O/sub 7/; Si-ZrO/sub 2/:Y/sub 2/O/sub 3/; YSZ buffered Si; YSZ substrates; ZrO/sub 2/:Y/sub 2/O/sub 3/; buffer layer; high temperature seed layer; high temperature superconductors; perovskites; superconducting transition temperature; thermal coevaporation; thin PrBa/sub 2/Cu/sub 3/O/sub 7/ layers; Atmospheric measurements; Biological materials; Bismuth; Degradation; Epitaxial growth; Pollution measurement; Substrates; Surface morphology; Temperature; Yttrium barium copper oxide;
Journal_Title :
Applied Superconductivity, IEEE Transactions on
