Abstract
We report epitaxial growth by laser ablation of YBa 2Cu 3O 7 films on bare sapphire (1 102) substrate. Owing to suitable substrate treatment, we have succeeded to grow superconducting YBCO films with Tc( R = 0) above 88 K and ϱ(300K)/ϱ(100K) around 2.80; first promising Rs value of 17 mΩ was measured at 10 GHz and 77 K.
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