В рамках (псевдо)спинового S = 1 формализма показано, что структура антифазных доменных границ в фазе зарядового упорядочения системы со смешанной валентностью типа " триплета" Cu 1+,2+,3+ в купратах на двумерной квадратной решетке существенно зависит от параметра одноцентровых корреляций U. Компьютерное моделирование на больших квадратных решетках иллюстрирует изменение структуры границ от однородной моновалентной непроводящей типа Cu 2+ до нитевидной сверхпроводящей при относительно небольшом изменении положительных значений U.
We investigated the phase diagrams of a system of charged semi-hardcore bosons in the mean-field approximation. It is shown that an increase in the local correlation parameter leads to the transformation of the phase diagram of the system from the form characteristic of hard-core bosons to the limit form with a parabolic dependence of the critical temperature of the charge ordering on the boson concentration. The evolution between these limiting cases depends on the ratio of the model parameters and is accompanied by various effects, including a change in the type of phase transition, the appearance of new order-order transitions, and the appearance of new critical points.
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