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Spatial inhomogeneity of the superconducting gap and order parameter in FeSe<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.4</mml:mn></mml:mrow></mml:msub></mml:math>Te<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow /><mml:mrow><mml:mn>0.6</mml:mn></mml:mrow></mml:msub></mml:math>
We have performed a low-temperature scanning tunneling microscopy and spectroscopy study of the iron chalcogenide superconductor ${\mathrm{FeSe}}_{0.4}{\mathrm{Te}}_{0.6}$ with ${T}_{\mathrm{C}}\ensuremath{\approx}14$ K. Spatially resolved measurements of the superconducting gap reveal substantial inhomogeneity on a nanometer length scale. Analysis of the structure of the gap seen in tunneling spectra by comparison with calculated …