Journal
ADVANCES IN PHYSICS
Volume 49, Issue 3, Pages 257-320Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/000187300243345
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The heavy fermion semiconductors, or Kondo insulators, are very narrow gap semiconductors in which the properties show unusual temperature dependencies. We shall review their properties and show how they can be interpreted in terms of an electronic band structure, with a temperature dependent hybridization gap together with temperature dependent quasi-particle lifetimes. The properties of these semiconductors are very sensitive to impurities, which can enhance the incipient antiferromagnetic correlations and precipitate a magnetic instability.
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