Abstract
Superconducting NdBa2Cu3O7−δ (NBCO) thin films with T c=89 K have been successfully grown on bare (1\(\overline 1\)02) sapphire substrates by pulsed laser deposition (PLD). The X-ray diffraction results show that the as-grown NBCO films are all c-axis oriented with no observable second phase. The c-axis parameter decreases monotonically with increasing the deposition temperature (T s), suggesting that the corresponding degradation of T c for T s>790°C might not originate from oxygen deficiency. It is conceived that the film-substrate reaction that occurring at the interface may cause Ba-deficiency and hence enhance Nd-Ba antisite substitutions.
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Cheng, T.Y., Lin, P.I., Chen, S.F. et al. Superconducting NdBa2Cu3O7−δ Thin Films Grown on Bare (1\(\overline 1\)02) Sapphire by Pulsed Laser Deposition. Journal of Low Temperature Physics 131, 557–561 (2003). https://doi.org/10.1023/A:1022967706861
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DOI: https://doi.org/10.1023/A:1022967706861