Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2010

Идентификатор DOI: 10.1007/s11232-010-0008-4

Ключевые слова: periodic Anderson model, heavy fermion, antiferromagnetism, canted phase, KONDO-LATTICE, VALENCE

Аннотация: We study the effect of the magnetic-field-induced canting of magnetic sublattices on the energy structure of heavy fermion quasiparticles in intermetallides with antiferromagnetic-type ordering. We work in the framework of an effective Hamiltonian of the periodic Anderson model in the regime of strong electron correlations. With the virtual transfers into high-energy double states taken into account, this Hamiltonian involves exchange interactions between spin moments of the f ions and the s-f-exchange coupling between the two subsystems. For a noncollinear problem geometry, we introduce a unitary transformation that allows reducing an eighth-order equation for the spectrum of heavy fermions to two fourth-order equations. We show that the quasimomentum dependence of the heavy-fermion energy changes qualitatively under the transition from the antiferromagnetic phase to a phase with a considerable canting angle emerging in an external magnetic field.

Журнал: THEORETICAL AND MATHEMATICAL PHYSICS

Выпуск журнала: Vol. 162, Is. 1

Номера страниц: 106-125

ISSN журнала: 00405779

Место издания: NEW YORK

Издатель: SPRINGER

• Val'kov V.V. (RAS, Siberian Branch, Inst Phys, Krasnoyarsk, Russia;; )
• Dzebisashvili D.M. (Fed Siberian Univ, Krasnoyarsk, Russia)

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