Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2005

Идентификатор DOI: 10.1134/1.1901772

Аннотация: The renormalizations of the fermionic spectrum are considered within the framework of the t-J* model taking into account three-center interactions (H-(3)) and magnetic fluctuations. Self-consistent spin dynamics equations for strongly correlated fermions with three-center interactions were obtained to calculate quasi-spin correlators. A numerical self-consistent solution to a system of ten equations was obtained to show that, in the nearest-neighbor approximation, simultaneously including H-(3) and magnetic fluctuations at n > n(1) (n(1) approximate to 0.72 for 2t/U = 0.25) caused qualitative changes in the structure of the energy spectrum. A new Van Hove singularity is then induced in the density of states, and an additional maximum appears in the T-c(n) concentration dependence of the temperature of the transition to the superconducting phase with order parameter symmetry of the d(x2-y2) type. (C) 2005 Pleiades Publishing, Inc.

Журнал: JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS

Выпуск журнала: Vol. 100, Is. 3

Номера страниц: 608-616

ISSN журнала: 10637761

Место издания: MELVILLE

Издатель: AMER INST PHYSICS

• Val'kov V.V. (Krasnoyarsk State University)
• Dzebisashvili D.M. (Krasnoyarsk State University)

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