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Phase Separation in Models for Manganites: Theoretical Aspects and Comparison with Experiments
E. Dagotto, S. Yunoki, A. Moreo
This paper is an informal review of the present status of the computational studies of models for manganites that recently reported the existence of phase separation at low tempera…
Influence of Nearest-Neighbor Coulomb Interactions on the Phase Diagram of the Ferromagnetic Kondo Model
A. L. Malvezzi, S. Yunoki, E. Dagotto
The influence of a nearest-neighbor Coulomb repulsion of strength V on the properties of the Ferromagnetic Kondo model is analyzed using computational techniques. The Hamiltonian s…
Stripe Stability in the Extended t-J Model on Planes and Four-Leg Ladders
T. Tohyama, C. Gazza, C. T. Shih +4
The tendencies to phase-separation and stripe formation of the t-J model on planes and four-leg ladders have been here reexamined including hole hopping terms t', t'' beyond neares…
Indications of Unconventional Superconductivity in Doped and Undoped Triangular Antiferromagnets
Matthias Vojta, Elbio Dagotto
The possibility of superconductivity in doped and undoped triangular antiferromagnets is discussed. Using the Bethe-Salpeter (B-S) equation, it is shown that the exchange of RPA pa…
Phase Separation Induced by Orbital Degrees of Freedom in Models for Manganites with Jahn-Teller Phonons
S. Yunoki, A. Moreo, E. Dagotto
The two-orbital Kondo model with classical Jahn-Teller phonons is studied using Monte Carlo techniques. The observed phase diagram is rich, and includes a novel regime of phase sep…
Unified Quantum Mechanical Picture for Confined Spinons in Dimerized and Frustrated Spin S=1/2 Chains
Goetz S. Uhrig, Friedhelm Schoenfeld, Markus Laukamp +1
A quantum mechanical picture is presented to describe the behavior of confined spinons in a variety of S=1/2 chains. The confinement is due to dimerization and frustration and it m…