Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2010

Идентификатор DOI: 10.1088/1742-6596/200/1/012050

Ключевые слова: Critical temperatures, Electron concentration, Hubbard, Hubbard operators, Joint effect, Normal phase, One-loop approximation, Order parameter, Renormalization, Scattering process, Strongly correlated electrons, Superconducting phase, Superconducting state, Distribution functions, Mathematical operators, Superconductivity, Spin fluctuations

Аннотация: The effect of spin-fluctuation scattering processes on the region of the superconducting phase in the strongly correlated electrons (Hubbard fermions) has been investigated by the diagram technique for Hubbard operators. It is shown that spin fluctuations in the one-loop approximation for the t - t? - t? - J*- model taking into account long-range hoppings and three-center interactions are reflected by components of the strength operator. In this approximation for the d-type symmetry of the order parameter for the superconducting phase a system of infinite integral equations has been derived. Obtained dependencies of critical temperature on the electron concentrations show that joint effect of long-range hoppings, three-center interactions, and dynamical spin-fluctuation processes leads to strong renormalization of the superconducting phase region. It was shown that these processes essentially modify distribution functions of Hubbard fermions in normal phase. © 2010 IOP Publishing Ltd.

Журнал: International Conference on Magnetism, ICM 2009 (26 July 2009 through 31 July 2009, Karlsruhe

Выпуск журнала: Vol. 200, Is. SECTION 1

• Val'kov V.V. (Siberian Federal University)
• Golovnya A.A. (Siberian State Aerospace University)

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• Ядро РИНЦ (eLIBRARY.RU)