Abstract
We report on the epitaxial growth of BaCuO2 infinite layer (stabilised with CO3 groups) thin films by rf magnetron sputtering on (100) SrTiO3 and (100) LaAlO3. Excellent (001) films with c∼4Å are obtained at 540 °C in a sputtering atmosphere of 1–10 mTorr of Ar+O2 with some addition of CO2. Off axis x-ray analysis reveal perfect in plane ordering and a tetragonal structure with a=b∼3.96 Å. For these deposition conditions the resistivity at room temperature is of the order of several Ωcm and exhibits a strong semiconductor-like behaviour. When the deposition temperature is increased to 660 °C, a supercell along the c axis appears with a period of about 8Å. After an in-situ annealing of these films in 7 Torr of oxygen at 500 °C, ϱ(300K) falls to 800μΩcm. The resistance versus temperature curve reveals then a metallic behaviour and a superconducting transitions with onsets between 10–40K.
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Koller, E., Fàbrega, L., Triscone, J.M. et al. Epitaxial growth and properties of (CO3) stabilised BaCuO2 superconducting thin films. J Low Temp Phys 105, 1325–1330 (1996). https://doi.org/10.1007/BF00753884
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DOI: https://doi.org/10.1007/BF00753884