Abstract
To study the interatomic correlations in anharmonic crystals we have used the correlative method of unsymmetrized self-consistent field (CUSF). The zeroth-order approximation of this method takes into account the main anharmonic terms but disregards the dynamical interatomic correlations at intermediate and long distances. With the aid of the first- and second-order perturbation theory we have derived the general expressions for quadratic correlations in two-dimensional models of crystals taking into account anharmonic terms up to the fourth order. Herewith we have constructed the corresponding diagrams. Correlations between the nearest, second, and third neighbors in square lattice have been calculated.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
