<title>High-resolution photoelectron yield spectroscopy of oxide superconductors</title>
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説明
We have designed and constructed a cryogenic photoelectron yield spectroscopy (PYS) and demonstrated a high energy resolution of 10 meV and a wide dynamic range of 7 orders of magnitude. This system enabled us to measure the absolute value of work function and analyze the electronic structure around the Fermi level (EF) for a Bi2Sr2CaCu2Ox(BSCCO) single crystal and YBa2Cu3O7-(delta ) (YBCO) epitaxial films. When the photoelectron was collected along axis, semiconductive spectrum having a broad tail was observed for both materials. When the measurement was performed from the edge of CuO2 plane, we observed metallic spectra with sharp threshold, of which slope depended on temperature in a way consistent with the Fermi-Dirac distribution function. For BSCCO, a metallic spectrum superimposed a dip structure at 10 K in the vicinity of EF. The data could be well fitted with a curve numerically simulated from the BCS function with a superconducting gap value ((Delta) ) of 20 meV.© (1996) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
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- SPIE Proceedings
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SPIE Proceedings 2696 523-532, 1996-06-10
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