F.M. Zimmer

Spin glass and ferromagnetism in disordered cerium compounds

The competition between spin glass, ferromagnetism and Kondo effect is analysed here in a Kondo lattice model with an inter-site random coupling

Quantum critical point in the spin glass–antiferromagnetism competition in Kondo lattice systems

J_{ij}

Van Hemmen-Kondo model for disordered strongly correlated electron systems

between the localized magnetic moments given by a generalization of the Mattis model which represents an interpolation between ferromagnetism and a highly disordered spin glass. Functional integral techniques with Grassmann fields have been used to obtain the partition function. The static approximation and the replica symmetric ansatz have also been used. The solution of the problem is presented as a phase diagram giving

A Kondo cluster-glass model for spin glass Cerium alloys

T/{J}

Doniach diagram for ordered, disordered and underscreened Kondo lattices

{\it versus}

The van Hemmen–Kondo model for disordered cerium systems

J_K/J

One-step replica symmetry breaking solution for a highly asymmetric two-sublattice fermionic Ising spin-glass model in a transverse field

where

Spin liquid and infinitesimal-disorder-driven cluster spin glass in the kagome lattice.

T

A theoretical study of the spin glass-Kondo-magnetic disordered alloys in the presence of a random field

is the temperature,

The spin glass-antiferromagnetism competition in Kondo-lattice systems in the presence of a transverse applied magnetic field

J_{K}