This article is cited in 2 papers

Properties of the heavy-fermion spectrum in the canted phase of antiferromagnetic intermetallides

V. V. Val'kov^a, D. M. Dzebisashvili<sup>b

a</sup> Institute of Physics, Siberian Branch, RAS, Krasnoyarsk, Russia
^b Federal Siberian University, Krasnoyarsk, Russia

Abstract: 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.

Keywords: periodic Anderson model, heavy fermion, antiferromagnetism, canted phase.

Received: 29.04.2009

DOI: 10.4213/tmf6460

 English version: Theoretical and Mathematical Physics, 2010, 162:1, 106–125

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