49 citations · 94 across the 7 of their papers we have counts for
7 papers
Quantum spherical spin-glass with random short-range interactions
Pedro Castro Menezes, Alba Theumann
In the present paper we analyze the critical properties of a quantum spherical spin glass model with short range, random interactions. Since the model allows for rigorous detailed…
Quantum Spherical Spin Glass.Supersymmetry and Annealing
Pedro Castro Menezes, Alba Theumann
We show that the effective action of the quantum spherical spin glass is invariant under a generalized form of the Becchi-Rouet-Stora-Tyutin(BRST) supersymmetry. The Ward identitie…
Replica symmetry breaking in the transverse-field Ising spin-glass model: Two frmionic representations
Eduardo M. M. Santos, Alba Theumann
We analyze the infinite range Ising spin-glass in a transverse-field below the critical temperature by a one step replica symmetry theory(1S-RSB). The set of n replicas is divided…
Quantum Critical Point in the Spin Glass-Kondo Transition in Heavy Fermion Systems
Alba Theumann, B. Coqblin
The Kondo-Spin Glass competition is studied in a theoretical model of a Kondo lattice with an intra-site Kondo type exchange interaction treated within the mean field approximation…
Spin Glass and antiferromagnetism in Kondo lattice disordered systems
S. G. Magalhaes, A. A. Schmidt, F. M. Zimmer +2
The competition between spin glass (SG), antiferromagnetism (AF) and Kondo effect is studied here in a model which consists of two Kondo sublattices with a gaussian random interact…
Spin glass freezing in Kondo lattice compounds
Alba Theumann, B. Coqblin, S. G. Magalhaes +1
It is presented a theory that describes a spin glass phase at finite temperatures in Kondo lattice systems with an additional RKKY interaction represented by long range, random cou…