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Proceedings Paper

Doping and charge-carrier density effects in the cuprate superconductors
Author(s): David B. Tanner; Young-Duck Yoon; Axel Zibold; H. L. Liu; Manuel A. Quijada; S. W. Moore; John B. Graybeal; Beomhoan O; John T. Markert; Ronald J. Kelley; Marshall Onellion; J-H. Cho
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Paper Abstract

The undoped phases of the copper-oxide materials are antiferromagnetic insulators, with a gap of 1.5 - 2 eV. Infrared spectroscopy of these compounds reveals weak absorption, possibly of magnetic origin, in this gap. When the materials are doped, oscillator strength is removed from the charge transfer band. This oscillator strength moves to low frequency, to become midinfrared and free carrier absorption. A systematic study of the electron-doped Nd2- xCexCuO4-y system reveals that the growth of low-frequency oscillator strength with doping concentration x is twice as rapid as in the case of hole-doped materials, such as La2-xSrxCuO4. This behavior is in accord with electronic structure models based on the 3-band Hubbard model and inconsistent with one-band behavior. However, an anomaly occurs for samples which are doped to the critical concentration for superconductivity; these have a greater than expected free-carrier concentration and weaker charge-transfer bands.

Paper Details

Date Published: 10 June 1996
PDF: 11 pages
Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); doi: 10.1117/12.241744
Show Author Affiliations
David B. Tanner, Univ. of Florida (United States)
Young-Duck Yoon, Univ. of Florida (United States)
Axel Zibold, Univ. of Florida (United States)
H. L. Liu, Univ. of Florida (United States)
Manuel A. Quijada, Univ. of Florida (United States)
S. W. Moore, Univ. of Florida (United States)
John B. Graybeal, Univ. of Florida (United States)
Beomhoan O, Univ. of Texas/Austin (United States)
John T. Markert, Univ. of Texas/Austin (United States)
Ronald J. Kelley, Univ. of Wisconsin (United States)
Marshall Onellion, Univ. of Wisconsin/Madison (United States)
J-H. Cho, Los Alamos National Lab. (United States)

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

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