Preparation of superconducting HgBa2CaCu2Ox thin films on the distinct substrates

Superconducting HgBa2CaCu2Ox (Hg-1212) films with a thickness of ∼0.5 μm have been prepared by means of annealing mercury-free precursor films on distinct substrates. X-ray diffraction indicates that the films consist of Hg-1212 phase grains with C-axis orientation. The scanning electron microscope (SEM) pictures of the film surface show the occurrence of layered spiral-like growth features and rectangular shaped platelike grains with a size of 1–3 μm. In electrical transport measurements, the two as-prepared films exhibit zero resistance temperatures of 120 K and a zero-field Jc of 4×105 A cm2 at 77 K.