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Temperature and Frequency Dependence of the Infrared Absorption in Three Kinds of Bi-Based Compounds

Published online by Cambridge University Press:  26 February 2011

Y. Hayashi ,
Y. Harada ,
H. Sasakura  and
M. Nagayama
Y. Hayashi
Affiliation:
Materials Science, Integrated Arts and Sciences, University of Osaka Prefecture, 1–1 Gakuencho, Sakai, 593, Japan
Y. Harada
Affiliation:
Materials Science, Integrated Arts and Sciences, University of Osaka Prefecture, 1–1 Gakuencho, Sakai, 593, Japan
H. Sasakura
Affiliation:
Materials Science, Integrated Arts and Sciences, University of Osaka Prefecture, 1–1 Gakuencho, Sakai, 593, Japan
M. Nagayama
Affiliation:
Materials Science, Integrated Arts and Sciences, University of Osaka Prefecture, 1–1 Gakuencho, Sakai, 593, Japan
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Abstract

Infrared absorption measurements have been made in three kinds of Bi compounds of a high-Tc family mainly by making use of powdered samples. Two of them are superconductors with Tc's of 108 K and 82 K, respectively, and the remaining one is a semiconductor. In each of the superconducting compounds, there appears Mid-Infrared absorption band: No such absorption band is found in the semiconducting compound. At Far-Infrared region, many absorption peaks due to phonons are clearly detected in all of these samples. Some of the phonon modes have been identified. At very low energy region, free carrier absorption appears in superconductors. Only this part of the absorption shows a temperature dependence. Absorption intensity decreases as the temperature decreases.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 275: Symposium S – Layered Superconductors: Fabrication, Properties and Applications , 1992 , 837
Copyright
Copyright © Materials Research Society 1992

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References

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