Density of states of layer compounds. 2H‐NbSe2

The density of states of the transition‐metal layer compound 2H‐NbSe2, is calculated for both valence and conduction bands. The solid is studied by means of two different oneelectron models, one where the sandwiches of the structure interact with each other and one where instead each sandwich is treated as isolated. The densities of states given by the two models are compared with that determined by means of experiments of photoemission and transmission of synchrotron radiation. That obtained considering an isolated sandwich agrees better with the experimental curves. This seems to indicate that the oneelectron picture is inadequate to describe the intersandwich interactions in layered structures and therefore that the kz dependence of the calculated band structure E(k) should not be looked at as really reliable.