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Infrared Absorption by Granular Metals

Published online by Cambridge University Press:  28 February 2011

D.B. Tanner ,
Y.H. Kim  and
C.L. Carr
D.B. Tanner
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611
Y.H. Kim
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611
C.L. Carr
Affiliation:
Department of Physics, University of Florida, Gainesville, FL 32611
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Abstract

The infrared properties of granular metals and superconductors are qualitatively in accord with effective medium ideas, with insulating behavior below a percolation transition and metallic response above. An exception is the far-infrared absorption at low metallic concentrations, which is much stronger than theoretical predictions. Measurements of superconductors and of normal metals in different hosts suggest that this absorption is predominately electric dipole rather than the magnetic dipole (eddy current) absorption which is expected to be the dominant low-frequency loss in highly conducting particles. Measurements of clustered and non-clustered samples suggest that the strong far-infrared absorption does not arise from the clustering together of the individual metallic particles, although clustering does lead to about a tenfold increase in absorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 3
Copyright
Copyright © Materials Research Society 1990

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References

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