Dielectric properties of epitaxial Pb1?x
Sn
x
Te layers at microwave frequencies |
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Authors: | H Lehmann G Nimtz L D Haas T Jakobus |
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Institution: | 1. II. Physikalisches Institut, Universit?t, D-5000, K?ln 41, Germany
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Abstract: | The dielectric properties of epitaxial Pb1−x
Sn
x
Te layers are investigated at 9 GHz in a composition range betweenx=0 and 0.225. The samples are characterized by fairly low carrier concentrations between 1.4×1016 and 32×1016 cm−3. Data of the static dielectric constant (ε
s
) are obtained at temperatures of 77 and 300 K. The results of ε
s
are 25% to 100% higher compared to previous measurements in bulk material from other authors. The observed higher values
of ε
s
in the investigated samples may be due to the reduced number of point defects in epitaxially grown Pb1−x
Sn
x
Te layers. The model of Kawamura which predicts a dependence of ε
s
on the effective band gap cannot be verified. |
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Keywords: | 72 15 77 20 |
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