Fabrication and physical properties of very thin HgBa2CaCu2O6+δ films

Epitaxial c-axis-oriented HgBa2CaCu2O6+delta (Hg-1212) films similar to 50-80 nm thick have been grown on (001) LaAlO3 substrates using a cation-exchange process. These films show smooth surface morphology and high-quality epitaxy. The superconducting transition temperatures are up to 118 K. In zero applied magnetic fields, the critical current densities of these films are typically above 10(7) A/cm(2) at 5 K and remain up to 3.54 x 10(5) A/cm(2) at 100 K. (C) 2000 Published by Elsevier Science B.V. All rights reserved.