Тип публикации: статья из журнала
Год издания: 2016
Идентификатор DOI: 10.1134/S0021364016110138
Аннотация: Singular points of the autocorrelation function on the imaginary time axis that is averaged over the location of spins in the magnetically dilute spin lattice with isotropic spin-spin interaction at a high temperature have been studied. For the autocorrelation function in the approximation of the self-consistent fluctuating local fПоказать полностьюield, nonlinear integral equations have been proposed which reflect the separation of the inhomogeneous spin systems into close spins and other spins. The coordinates of the nearest singular points have been determined in terms of the radius of convergence of the expansion in powers of time, the coefficients of which have been calculated from recurrence equations. It has been shown that the coordinates of singular points and, consequently, the wings of the autocorrelation function spectrum at strong magnetic dilution are determined by the modulation of the local field by the nearest pairs of spins leading to its logarithmic concentration dependence.
Журнал: JETP LETTERS
Выпуск журнала: Vol. 103, Is. 11
Номера страниц: 687-691
ISSN журнала: 00213640
Место издания: NEW YORK
Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER