Daniel Reyes

Thermodynamic quantum critical behavior of the Kondo necklace model

We obtain the phase diagram and thermodynamic behavior of the Kondo necklace model for arbitrary dimensions

Bose-Einstein condensation in antiferromagnets close to the saturation field

d

Dimensional crossover in anisotropic Kondo lattices

using a representation for the localized and conduction electrons in terms of local Kondo singlet and triplet operators. A decoupling scheme on the double time Greens functions yields the dispersion relation for the excitations of the system. We show that in

Thermodynamic quantum critical behavior of the anisotropic Kondo necklace model

d\geq 3

s- and d-wave superconductivity in a two-band model

there is an antiferromagnetically ordered state at finite temperatures terminating at a quantum critical point (QCP). In 2-d, long range magnetic order occurs only at T=0. The line of Neel transitions for

Pomeranchuk-Nematic instability in the presence of a weak magnetic field

d>2

Phase diagram of the Kondo necklace model at finite temperatures

varies with the distance to the quantum critical point QCP

Crossover from 2d to 3d in anisotropic Kondo lattices

|g|

Field induced magnetic quantum critical behavior in the Kondo necklace model

as,

Kondo necklace model in approximants of Fibonacci chains

T_N \propto |g|^{\psi}