Comment on "new three-dimensional k→•p→ model for the electronic structure of A-15 compounds"

It is pointed out that the fine structure in the density of states in the R-point model of A-15 compounds proposed by Lee, Birman, and Williamson to fit the anomalous properties of Nb3Sn and V3Si is (i) based on bands which are ∼100 times flatter than calculated band structures, and (ii) sensitive to cutoff procedures adopted to determine the density of states. Thus the model in its present form does not appear to be a viable picture of the anomalies present in these materials.