Doping and charge-carrier density effects in the cuprate superconductors

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

doi:10.1117/12.241744

10 June 1996 Doping and charge-carrier density effects in the cuprate superconductors

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

Author Affiliations +

Proceedings Volume 2696, Spectroscopic Studies of Superconductors; (1996) https://doi.org/10.1117/12.241744
Event: Photonics West '96, 1996, San Jose, CA, United States

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 Nd_{2- x}Ce_xCuO_4-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 La_2-xSr_xCuO₄. 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.

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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, and J-H. Cho "Doping and charge-carrier density effects in the cuprate superconductors", Proc. SPIE 2696, Spectroscopic Studies of Superconductors, (10 June 1996); https://doi.org/10.1117/12.241744

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