We succeed for the first time in growing a superconducting TlBa2Ca2Cu3Oy film on MgO〈100〉 substrate using a liquid-gas solidification process (LGS). The films are grown in situ; they are deposited by LGS. There is no post-anneal or compensation of Tl applied after the initial deposition. The as-grown film shows a flat and uniform morphology with the c axis perpendicular to the MgO〈100〉. It exhibits a resistant transition onset of 117 K and zero resistance at 103 K.
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Chou et al. (1991) studied this question.