PREPARATION OF SRCUOY FILM IN ULTRA-HIGH VACUUM-SYSTEM

SrCuO2 crystal contains two-dimensional CuO2 planes like those constituting supercurrent path in high T(c) superconducting cuprates. We have investigated on epitaxial SrCuOy film growth on SrTiO3(001) substrate by ArF pulsed laser deposition in ultra-high vacuum. In situ RHEED and XPS diagnoses of the film growth process under a very low NO2 pressure indicated that there were slight fluctuations in surface and electronic states of the initial 1 nm thick film growth. Beyond this initial stage, the film growth gave streaky RHEED pattern with its intensity oscillated at a periodicity corresponding well to the c-axis length of SrCuO2, verifying the layer-by-layer growth. The as-grown film was electrically conductive.