Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-07-20
Physics
Condensed Matter
Strongly Correlated Electrons
2 pages, 2 figures, submitted to SCES2004
Scientific paper
10.1016/j.physb.2005.01.211
We investigate the effect of magnetic fields on a Kondo insulator by using the periodic Anderson model. The analysis by dynamical mean field theory combined with quantum Monte Carlo simulations reveals that the magnetic field drives the Kondo insulator to a transverse antiferromagnetic insulator at low temperatures. We calculate the staggered spin susceptibility and find its divergence signaling the antiferromagnetic instability. Further investigation of the spin correlation functions and the magnetization process clarifies how the magnetic field suppresses the Kondo singlet formation and induces the transverse antiferromagnetic ordering.
Kawakami Norio
Koga Akihisa
Ohashi Takuma
Suga Sei-ichiro
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