Spin and Magnetic Field Dependences of Quasiparticle Mass in Ferromagnetic State of Heavy Fermions

We investigate the mechanism underlying the suppression of heavy-fermion mass enhancement in the presence of a magnetic field. In the framework of statistically consistent Gutzwiller method (SGA) we study the periodic Anderson model in the strong correlation limit. The finite-U corrections are inclu...

Full description

Saved in:
Bibliographic Details
Published in:Journal of physics. Conference series 2012-01, Vol.391 (1), p.12022-4
Main Authors: Howczak, Olga, Spalek, Jozef
Format: Article
Language:English
Subjects:
Compensation
Correlation analysis
Electron spin
Electrons
Elementary excitations
Fermions
Ferromagnetic phases
Ferromagnetism
Magnetic fields
Magnetism
Mathematical models
Occupancy
Order disorder
Physics
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the mechanism underlying the suppression of heavy-fermion mass enhancement in the presence of a magnetic field. In the framework of statistically consistent Gutzwiller method (SGA) we study the periodic Anderson model in the strong correlation limit. The finite-U corrections are included systematically allowing to describe the coexistence of Kondo compensation effect and ferromagnetic ordering, as well as weak delocalization of the f-electrons. In particular, we observe that the resulting mass enhancement factor of spin-up electrons and that of spin-down are not equal in ferromagnetic phases and depend strongly on the applied field and the f-level occupancy. We predict that mass enhancement for the spin-up quasiparticles is larger then that of spin-down and both of them decrease in the applied magnetic field. We argue that above features, as well as a nonmonotonic variation of the quasiparticle effective masses observed in our model are in good agreement with earlier experimental measurements for CexLa1−xB6.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/391/1/012022