The effective Hamiltonian for cuprates at different energy scales

Описание

Тип публикации: статья из журнала (материалы конференций, опубликованные в журналах)

Конференция: International Conference on Magnetism (ICM 2006); Kyoto, JAPAN; Kyoto, JAPAN

Год издания: 2007

Идентификатор DOI: 10.1016/j.jmmm.2006.10.575

Ключевые слова: strong electron correlations; electronic structure; multiband p-d model

Аннотация: A multiband p - d model describes electronic properties of cuprates in the large energy scale similar to U similar to 10 eV. In the strong electron correlation ( SEC) limit we project out double occupied intra- atomic states and obtain the singlet - triplet t - t' - t'' - J(*) model at scale similar to Omega approximate to 0. 5 eV,Показать полностьюwhere Omega is the excitation energy between two- hole singlet and triplet states. At smaller energies similar to J one gets the usual t - t' - t'' - J(*) model. At energies similar to omega(D) one has to add electron - phonon interaction, and the low- energy effective Hamiltonian with magnetic and phonon mechanisms of pairing is constructed in SEC limit with parameters calculated from the ab initio approach. Magnetic mechanism of pairing results in a very high value of the critical temperature T-c while electron - phonon interaction suppresses d- pairing to the T-c similar to 100 K. (c) 2006 Elsevier B. V. All rights reserved.

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Издание

Журнал: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

Выпуск журнала: Vol. 310, Is. 2, Part1

Номера страниц: 93-95

ISSN журнала: 03048853

Место издания: AMSTERDAM

Издатель: ELSEVIER SCIENCE BV

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