Abstract
This paper reports on a comprehensive study of the effect of additional doping with the Na acceptor impurity on the low-temperature resistivity of PbTe samples doped with Tl (2 at %), an impurity producing a band of resonant states within the valence-band spectrum. By additional doping with Na, we have shifted the Fermi level within the band of the resonant states of Tl in PbTe and varied the hole filling (k h ) of the thallium impurity states. The larger part of the PbTe: (Tl,Na) samples transfers to the superconducting state with a critical temperature T c = 0.4–2.3 K. The T c (k h ) relation obtained argues for the fact that, in the region of resonant states in PbTe: Tl, Anderson localization of holes and a pseudogap in the density of delocalized states are observed.
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Original Russian Text © S.A. Nemov, Yu.I. Ravich, R.V. Parfen’ev, D.V. Shamshur, 2011, published in Fizika Tverdogo Tela, 2011, Vol. 53, No. 5, pp. 878–880.
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Nemov, S.A., Ravich, Y.I., Parfen’ev, R.V. et al. Anderson localization and the pseudogap in the energy spectrum of holes in PbTe: Tl under resonant scattering. Phys. Solid State 53, 936–938 (2011). https://doi.org/10.1134/S1063783411050210
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DOI: https://doi.org/10.1134/S1063783411050210