Нашли опечатку? Выделите ее мышкой и нажмите Ctrl+Enter
Название: Models of a Structural Phase Transition with General Anharmonicity and Disorder
Авторы: van Hemmen J.L., Zagrebnov V.A.
It is shown how the self-consistent phonon Ansatz leads to a new class of exactly soluble models of a structural phase transition. Both nonpolynomial anharmonicity and disorder are analyzed in detail. In the classical limit, the thermodynamics is obtained and sufficient conditions on the anharmonicity are given to ensure a soft-mode phase transition. Diagonal disorder has been studied numerically. It is found that in three dimensions a pronounced mobility edge, separating localized and delocalized phonon states, may exist.