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 thПоказать полностьюe 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