Recent photoemission experiments on sodium tungsten bronzes, NaₓTayW_1-yO₃, have revealed a depletion of the density of states near the chemical potential in insulating samples. We propose that this depletion is a Coulomb gap, and that these experiments represent the first direct measurement of a Coulomb gap in a disordered insulator. Our conclusion is supported by physical estimates and numerical calculations of the density of states for a classical model of NaₓTayW_1-yO₃. The width and shape of the calculated bands agree well with the experiments.
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Davies et al. (1986) studied this question.
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