Structure dependence of Compton profiles. Model study

Publisher Website
Google Scholar
Abstract
In order to test the usefulness of Compton scattering for the investigation of structural effects on the ground state of solids, the structure dependence of the density of states (DOS), momentum density (MD), and Compton profile (CP) has been studied using various ordered and disordered arrays of atom potentials of the Koster-Slater impurity type. For the crystalline arrays the results are exact within the one-electron approximation. The dependence of the crystalline DOS, MD, and CP on the atom density and the anisotropy of the structure is discussed. For the disordered distribution of atoms the results are exact within the coherent-potential approximation. The results show that disorder is seen as a more atomiclike behavior of the MD and the CP, and that the disorder-induced changes in these quantities are detectable with the presently achievable experimental accuracy. In addition, approximate methods for evaluating MD's and CP's are discussed and conclusions on their quality drawn.