  We study a non-relativistic field theory model for the Kondo lattice. The
Fierz identity and the mean-field approximation transform our model into an
Anderson-like model that is stabilized by a scalar-type s-d interaction term.
Numerical minimization of the thermodynamic potential shows that the Kondo
condensation forms when the temperature is low, and the s-d coupling is strong.
The formation of the Kondo condensation at zero temperature turns out to give a
first-order quantum phase transition. Though these results are very suggestive
and consistent with previous large-N studies, they work only when the
mean-field theory is justified in strong coupling, as usual. We build a
holographic model as an effective mean-field theory for the Kondo lattice with
strong coupling, by considering interacting two-flavor spinors, one in standard
quantization and the other one in the mixed quantization, both them coupled
with scalar orders representing the Kondo condensation. Our model realizes the
extended Fermi surface as well as the large fermion mass of heavy fermion
physics in the strong coupling regime.
