Abstract
We report the effects of growth conditions on the superconducting properties of FeSe films epitaxially grown on LaAlO3 substrates by pulsed laser deposition (PLD). Customary materials characterization techniques [X-ray diffraction (XRD), in-situ X-ray photoelectron spectroscopy (XPS), in-situ ultra-violet photoelectron spectroscopy (UPS), and scanning electron microscopy (SEM)] revealed the films had a c-axis oriented tetragonal structure with lattice constants dependent on the growth temperature (varied from 100 to 600°C). The standard four-point probe method was used to measure the resistivity and superconducting transitions. Films grown at 400–550°C showed a clear superconducting onset but no zero resistance down to 2 K. The highest superconducting onset temperature (\(T_{\mathrm{c}}^{\mathrm{onset}}\)) of 8 K was observed in films grown at 500°C and the onset temperature was clearly correlated to the ratio of the lattice constants (c/a). As the thickness of the FeSe films increased from 27 nm to 480 nm, \(T_{\mathrm{c}}^{\mathrm{onset}}\) also increased as the strain in the system was relaxed.
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Tsukada, A., Luna, K.E., Hammond, R.H. et al. Pulsed laser deposition conditions and superconductivity of FeSe thin films. Appl. Phys. A 104, 311–318 (2011). https://doi.org/10.1007/s00339-010-6136-8
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DOI: https://doi.org/10.1007/s00339-010-6136-8