Far Infrared Thermomodulation in Hg0.8Cd0.2Te

  • M. van Burgt
  • P. Janssen
  • L. van Bockstal
  • F. Herlach
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 71)

Abstract

The narrow gap semiconductor Hg1−xCdxTe has been extensively studied for its peculiar magnetotransport properties [1–3]. Magnetotransmission in the far infrared was investigated by GOLDMAN et al [4]. It was our intention to study the magnetophotoconductivity in this material in order to observe conduction electron cyclotron resonance (CCR) and possibly impurity cyclotron resonance (ICR). With the laser chopped at a frequency of 20 Hz, a fairly strong signal was observed which contained the expected resonances. However, it was then discovered that this signal persisted when the sample current was turned off, and further investigation revealed that practically no photoconductive response could be detected in these samples in the low-field region (B < 1 T). We have come to the conclusion that the observed signal is due to a modulated thermoelectric voltage resulting from inhomogeneous heating of the sample by the chopped laser radiation.

Keywords

Helium Tantalum HCOOH 

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Literature

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Copyright information

© Springer-Verlag Berlin Heidelberg 1987

Authors and Affiliations

  • M. van Burgt
    • 1
  • P. Janssen
    • 1
  • L. van Bockstal
    • 1
  • F. Herlach
    • 1
  1. 1.Laboratorium voor Lage Temperaturen en Hoge-VeldenfysikaKatholieke Universiteit LeuvenLeuvenBelgium

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