Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1134/S004057791712011X
Ключевые слова: high-temperature conductor, magnetic susceptibility, spin polaron, spin-fermion model
Аннотация: Using the method of diagram techniques for the spin and Fermi operators in the framework of the SU(2)-invariant spin-fermion model of the electron structure of the CuO2plane of copper oxides, we obtain an exact representation of the Matsubara Green’s function D⊥(k, iωm) of the subsystem of localized spins. This representation incluПоказать полностьюdes the Larkin mass operator ΣL(k, iωm) and the strength and polarization operators P(k, iωm) and Π(k, iωm). The calculation in the one-loop approximation of the mass and strength operators for the Heisenberg spin system in the quantum spin-liquid state allows writing the Green’s function D⊥(k, iωm) explicitly and establishing a relation to the result of Shimahara and Takada. An essential point in the developed approach is taking the spin-polaron nature of the Fermi quasiparticles in the spin-fermion model into account in finding the contribution of oxygen holes to the spin response in terms of the polarization operator Π(k, iωm). © 2017, Pleiades Publishing, Ltd.
Журнал: Theoretical and Mathematical Physics(Russian Federation)
Выпуск журнала: Vol. 193, Is. 3
Номера страниц: 1853-1864
ISSN журнала: 00405779
Издатель: Maik Nauka Publishing / Springer SBM