Radiative Properties of Y-Ba-Cu-0 Films With Variable Oxygen Content

[+] Author and Article Information
B. I. Choi, Z. M. Zhang, M. I. Flik

Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA 02139

T. Siegrist

AT&T Bell Laboratories, Murray Hill, NJ 07974

J. Heat Transfer 114(4), 958-964 (Nov 01, 1992) (7 pages) doi:10.1115/1.2911907 History: Received July 01, 1991; Revised February 01, 1992; Online May 23, 2008


The room-temperature radiative properties of YBa2 Cu3 O7−δ superconducting films with varying oxygen content (δ = 0 to 1) on a LaAlO3 substrate are investigated. The fitting of reflectance spectra using thin-film optics and the Drude-Lorentz model function with multiple oscillators determines the optical constants. The film with high oxygen content (δ = 0) has a metallic optical behavior. A decrease in the oxygen content causes a removal of free carriers, and the film with low oxygen content (δ = 1) acts like a dielectric with a very weak free-electron contribution. Knowledge of the optical constants of oxygen-deficient YBa2 Cu3 O7-δ films facilitates accurate substrate temperature measurement and control during the film deposition process.

Copyright © 1992 by The American Society of Mechanical Engineers
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