Examining High Transition Temperature Superconductor YBCO Thin Films Using NanoSurf Scanning Tunnelling Microscopes

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

STM measurements on HTSC (YBa2Cu3O7-x) thin films (raw data). 500nm image of YBoCo

Figure 1. STM measurements on HTSC (YBa2Cu3O7-x) thin films (raw data). 500nm image of YBoCo

STM measurements on HTSC (YBa2Cu3O7-x) thin films (raw data). 200nm 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.

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