Тип публикации: статья из журнала
Год издания: 2012
Идентификатор DOI: 10.1134/S1063776112020264
Ключевые слова: Antiferromagnetic spins, Bi-layer, Bilayer cuprates, Concentration dependence, Cooper pair, Critical temperatures, Cuprates, High-temperature cuprate superconductors, Hubbard band, Mathematical equations, Mean field approximation, Single layer, Small perturbations, Spin correlations, Superconducting gaps, Copper compounds, High temperature superconductors, Oxide superconductors
Аннотация: The influence of interlayer hoppings on the superconducting transition temperature (T-c) in bilayer cuprates has been studied. The parameter of hopping between layers is expressed as t(perpendicular to)(k) = t(perpendicular to)(cos(k(x) ) - cos(k(y)))(2) and treated as a small perturbation for the states of two CuO2 planes describeПоказать полностьюd by the t-t'-t ''-J* model. In the generalized mean field approximation for d(x2y2) symmetry of the superconducting gap, neither the interlayer hopping or exchange interaction, nor the pair hopping between CuO2 layers provides an additional mechanism of Cooper pair formation or an increase in T (c). In the concentration dependence of T-c, the bilayer splitting of the upper Hubbard band of quasi-holes is manifested as two peaks with temperatures slightly lower than the maximum T-c for a single-layer cuprate. Interlayer antiferromagnetic spin correlations suppress bilayer splitting.
Журнал: JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS
Выпуск журнала: Vol. 114, Is. 2
Номера страниц: 329-342
ISSN журнала: 10637761
Место издания: NEW YORK
Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER