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High temperature superconducting thin films
have been deposited using the pulsed laser deposition method onto
SrTiO3 single crystalline substrates. The
substrate temperature was kept at 750°C and the deposited film thickness was
200nm (sample provided by University of
Basel).
High
Transition Temperature Superconductor
Figure 1. STM measurements on HTSC (YBa2Cu3O7-x)
thin films (raw data). 500nm image of YBoCo
Figure 2. STM measurements on HTSC (YBa2Cu3O7-x)
thin films (raw data). 200nm Image of YBoCo
Observations
From the STM experiment, typical defect
mediated spiral growth hills can be observed (see also Gerber et al. Nature 350
(1991) 279). The step height of the growth hills correspond to the unit cell of
the superconductor material YBa2Cu3O7 of
1.2nm. The tunnelling parameters were -1nA tunnelling current and -0.8V gap
voltage. |