Geodesic
Properties of the~heavy-fermion spectrum in the~canted phase of antiferromagnetic intermetallides
Teoretičeskaâ i matematičeskaâ fizika, Tome 162 (2010) no. 1, pp. 125-149

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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, canted phase.
Mots-clés : antiferromagnetism 
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     author = {V. V. Val'kov and D. M. Dzebisashvili},
     title = {Properties of the~heavy-fermion spectrum in the~canted phase of antiferromagnetic intermetallides},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {125--149},
     publisher = {mathdoc},
     volume = {162},
     number = {1},
     year = {2010},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_2010_162_1_a7/}
}
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V. V. Val'kov; D. M. Dzebisashvili. Properties of the~heavy-fermion spectrum in the~canted phase of antiferromagnetic intermetallides. Teoretičeskaâ i matematičeskaâ fizika, Tome 162 (2010) no. 1, pp. 125-149. http://geodesic.mathdoc.fr/item/TMF_2010_162_1_a7/