The x-ray diffraction pattern of the FeSe thin film. The diffraction peaks contributed from the SrTiO3 substrate are starred.
(Color online) The φ-scans of (101) and (221) peaks of the x-ray diffraction.
(Color online) Magnetic susceptibility χ of the FeSe thin film measured under field cool (FC) and zero field cool (ZFC) conditions. The inset shows the magnified ZFC result, indicating the onset of superconductivity at ∼9.2 K.
(Color online) Transient optical reflectivity changes of the FeSe thin film measured at 280 K (solid line). The carrier and thermal diffusion background signals are depicted by the dotted line. The inset shows the acoustic signals taken at different cryostat temperatures, which are vertically shifted for clarity (solid line). The oblique dotted lines mark the peak and/or dip positions of the echo signals, reflecting the advances of the echoes at lower temperatures.
(Color online) Stiffness coefficient C 33 of the FeSe thin film at different temperatures. The line is the result of the best fit using Varshni’s formula.
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