Growth of High-Quality Superconducting FeSe_0.5Te_0.5 Thin Films Suitable for Angle-Resolved Photoemission Spectroscopy Measurements via Pulsed Laser Deposition

【摘要】 High-quality superconducting FeSe_0.5Te_0.5 films are epitaxially grown on different substrates by using the pulsed laser deposition method.By measuring the transport properties and surface morphology of films grown on singlecrystal substrates of Al₂O₃（0001）,SrTiO₃（001）,and MgO（001）,as well as monitoring the real-time growth process on MgO substrates with reflection high energy electron diffraction,we find the appropriate parameters for epitaxial growth of high-quality FeSe_0.5 Te_0.5 thin films suitable for angle-resolved photoemission spectroscopy measurements.We further report the angle-resolved photoemission spectroscopy characterization of the superconducting films.The clearly resolved Fermi surfaces and the band structure suggest a sample quality that is as good as that of high-quality single-crystals,demonstrating that the pulsed laser deposition method can serve as a promising technique for in situ preparation and manipulation of iron-based superconducting thin films,which may bring new prosperity to angle-resolved photoemission spectroscopy research on iron-based superconductors.更多还原

【Abstract】 High-quality superconducting FeSe_0.5Te_0.5 films are epitaxially grown on different substrates by using the pulsed laser deposition method.By measuring the transport properties and surface morphology of films grown on singlecrystal substrates of Al₂O₃（0001）,SrTiO₃（001）,and MgO（001）,as well as monitoring the real-time growth process on MgO substrates with reflection high energy electron diffraction,we find the appropriate parameters for epitaxial growth of high-quality FeSe_0.5 Te_0.5 thin films suitable for angle-resolved photoemission spectroscopy measurements.We further report the angle-resolved photoemission spectroscopy characterization of the superconducting films.The clearly resolved Fermi surfaces and the band structure suggest a sample quality that is as good as that of high-quality single-crystals,demonstrating that the pulsed laser deposition method can serve as a promising technique for in situ preparation and manipulation of iron-based superconducting thin films,which may bring new prosperity to angle-resolved photoemission spectroscopy research on iron-based superconductors.更多还原