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.
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Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 161, No. 3, pp. 125–149, January, 2010. Original article submitted April 29, 2009.
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Val’kov, V.V., Dzebisashvili, D.M. Properties of the heavy-fermion spectrum in the canted phase of antiferromagnetic intermetallides. Theor Math Phys 162, 106–125 (2010). https://doi.org/10.1007/s11232-010-0008-4
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DOI: https://doi.org/10.1007/s11232-010-0008-4