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Growth and Properties of Epitaxial YBa2Cu3O7 thin Films on{1102}Al2O3

  • D. K. Fork (a1), T. H. Geballe (a1), K. Char (a2), S. S. Laderman (a3), R. Taber (a3), F. Bridges (a4), F. Ponce (a5), J. B. Boyce (a5) and G. A. N. Connell (a5)...

Abstract

Epitaxial YBa2Cu3O7 (YBCO) films were grown on r‐plane A12O3 {1102} by laser ablation. X‐ray diffraction shows that films are epitaxial with the c‐axis perpendicular to the substrate and the a or b axes parallel to (2201), although the full width at half maximum of the rocking curve is larger compared to those of epitaxial films on SrTiO3. The critical temperatures (zero resistance) are between 85 K and 88 K with transition widths between 0.5 K and 3 K. The 300 K resistivity of 250 μΩextrapolates to zero at zero temperature and the critical current is as high as 5 x 106 A/cm2 at 4.2 K according to magnetization hysteresis measurements. Surface resistance data shows that 2000 Å thick epitaxial films on {1102} have about 1 mΩ at 13 GHz at 4.2 K.

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