High-resolution photoelectron yield spectroscopy of oxide superconductors

Masashi Kawasaki; Satoru Ohashi; Toshikazu Kitajima; Satoshi Gonda; Noriyoshi Kanda; Ryuta Tsuchiya; Kohji Kishio; Hideomi Koinuma

doi:10.1117/12.241783

10 June 1996 High-resolution photoelectron yield spectroscopy of oxide superconductors

Masashi Kawasaki, Satoru Ohashi, Toshikazu Kitajima, Satoshi Gonda, Noriyoshi Kanda, Ryuta Tsuchiya, Kohji Kishio, Hideomi Koinuma

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241783
Event: Photonics West '96, 1996, San Jose, CA, United States

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 (E_F) for a Bi₂Sr₂CaCu₂O_x(BSCCO) single crystal and YBa₂Cu₃O_7-(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 E_F. The data could be well fitted with a curve numerically simulated from the BCS function with a superconducting gap value ((Delta) ) of 20 meV.

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Masashi Kawasaki, Satoru Ohashi, Toshikazu Kitajima, Satoshi Gonda, Noriyoshi Kanda, Ryuta Tsuchiya, Kohji Kishio, and Hideomi Koinuma "High-resolution photoelectron yield spectroscopy of oxide superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241783

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