Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2005-03-09
J. Phys.: Condens. Matter 17 (2005) 4547-4558
Physics
Condensed Matter
Strongly Correlated Electrons
11 pages, 10 figures. submitted to Journal of Physics: Condensed Matter
Scientific paper
10.1088/0953-8984/17/28/013
We study the Kondo lattice model with the Heisenberg-type RKKY-exchange coupling among localized f-spins in the presence of a magnetic field. By means of an extended dynamical mean field theory combined with the non-crossing approximation, we investigate the one-particle spectral function and the dynamical spin correlation function in the Kondo insulating phase. It is shown that the magnetic field and the RKKY exchange interaction both cause the instability to the antiferromagnetic order with enhanced transverse spin fluctuations, which give rise to a strong renormalization of quasi-particles as the system approaches the quantum critical point. This leads to a tendency to retain the Kondo insulating gap up to rather large fields.
Kawakami Norio
Ohashi Takuma
Suga Sei-ichiro
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