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Proceedings Paper

High-resolution photoelectron yield spectroscopy of oxide superconductors
Author(s): Masashi Kawasaki; Satoru Ohashi; Toshikazu Kitajima; Satoshi Gonda; Noriyoshi Kanda; Ryuta Tsuchiya; Kohji Kishio; Hideomi Koinuma
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Paper Abstract

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 <001> 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.

Paper Details

Date Published: 10 June 1996
PDF: 10 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241783
Show Author Affiliations
Masashi Kawasaki, Tokyo Institute of Technology (Japan)
Satoru Ohashi, Tokyo Institute of Technology (Japan)
Toshikazu Kitajima, Tokyo Institute of Technology (Japan)
Satoshi Gonda, Tokyo Institute of Technology (Japan)
Noriyoshi Kanda, Tokyo Institute of Technology (Japan)
Ryuta Tsuchiya, Tokyo Institute of Technology (Japan)
Kohji Kishio, Univ. of Tokyo (Japan)
Hideomi Koinuma, Tokyo Institute of Technology (Japan)

Published in SPIE Proceedings Vol. 2696:
Spectroscopic Studies of Superconductors
Ivan Bozovic; Dirk van der Marel, Editor(s)

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