Сибирский федеральный университет

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 includes 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

• Val’kov V.V. (Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAS, Krasnoyarsk, Russian Federation)
• Dzebisashvili D.M. (Kirensky Institute of Physics, Federal Research Center KSC Siberian Branch, RAS, Krasnoyarsk, Russian Federation, Siberian State Aerospace University, Krasnoyarsk, Russian Federation)

• Scopus