On the nature of the energy gap in ytterbium dodecaboride YbB12

  title={On the nature of the energy gap in ytterbium dodecaboride YbB12},
  author={T. S. Al’tshuler and Mikhail S. Bresler},
  journal={Physics of the Solid State},
The YbB12 Kondo insulator was studied by EPR. The energy spectrum of YbB12 was established to have a gap of width 2Δ≈12 meV. The experimental data are interpreted in terms of the excitonic-dielectric model. The temperature behavior of the gap was determined; it was found that Δ(T)=72 K at absolute zero and vanishes at ∼115 K. 



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