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Keywords:

  • filled skutterudite;
  • insulator–metal transition;
  • Kondo insulator

Abstract

The filled skutterudite compound CeOs4As12 displays phenomena that are associated with hybridization between the 4f-electron and conduction-electron states. This holds especially true for a semiconducting ground state with a main energy gap as small as Δ/kB = 45 K. When subjected to magnetic field, the hybridization gap semiconductor CeOs4As12 becomes metallic below around 2.5 K. Preliminary electrical-resistivity experiments provide evidence for an anisotropy of magnetic-field-induced insulator–metal transition in this cubic material. Our findings suggest a contribution of the quartet equation image states to transport properties of CeOs4As12.