Is a doped 'Kondo' insulator different from doped Silicon?

1997/01/02 by J. F. DiTusa, K. Friemelt, DiTusa, J. F. +7
Materials Science · Physics and Astronomy · #FOS: Physical sciences #Iron-based superconductors research #Rare-earth and actinide compounds #Semiconductor materials and interfaces #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.cond-mat/9701005

openalex publication_date 1997/01/02 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

We have observed the metal-insulator transition in the strongly correlated insulator FeSi with the chemical substitution of Al at the Si site. The magnetic susceptibility, heat capacity, and field dependent conductivity are measured for Al concentrations ranging from 0 to 0.08. For concentrations greater than 0.01 we find metallic properties quantitatively similar to those measured in Si:P with the exception of a greatly enhanced quasiparticle mass. Below 2 K the temperature and field dependent conductivity can be completely described by the theory of disordered Fermi Liquids.

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