We consider systems which exhibit typical critical dependence of the specific heat: ∆c ∝ (TC − T) −γ (T < TC); ∆c ∝ (T − TC) −γ ′ (T > TC) where γ,γ ′ are critical exponents (γ = α for ∆c = ∆cp,N , γ = α for ∆c = ∆cV,N), as well as, the case when ∆c ∝ (ln | TC − T |) a (a = 1 3 , uniaxial ferroelectrics; a = 1, liquid He 4). Starting from the critical behaviour of the specific heat we find the ...

We present a study of the critical phenomena around the quantum critical point in heavy-fermion systems. In the framework of the S = 1/2 Kondo lattice model, we introduce an extended decoupling scheme of the Kondo interaction which allows one to treat the spin fluctuations and the Kondo effect on an equal footing. The calculations, developed in a self-consistent one-loop approximation, lead to ...