Magnetic Phases and Generalized t-J Models in Doped Mott-Hubbard Insulators

• Authors: A. Oleś , J. Zaanen
• Languages of publication: EN

Abstracts

EN

We review some recent results obtained for the dynamics of a single hole and for the ground states at finite hole doping in t-J model. Next, we address the role of orbital degeneracy in doped Mott-Hubbard insulators and show examples of effective strong coupling models which include the orbital degrees of freedom. These new t-J models have interesting phase diagrams, with the new magnetic phases stabilized by a competition between magnetic energy and excitonic excitations. It is argued that the doped holes always bind to the excitons and that the new phases identified on the mean-field level give rise to local distortions of the lattice. We conclude that realistic t-J models derived from the electronic structure of particular compounds may be successfully applied for understanding both the observed magnetic ground states, and the results of photoemission experiments, as we have demonstrated recently for NiO.

Keywords

EN

74.72.-h; 64.60.-i; 64.90.+b; 75.40.-s

Discipline

• 74.72.-h: Cuprate superconductors
• 64.60.-i: General studies of phase transitions(see also 63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions; for critical phenomena in solid surfaces and interfaces, and in magnetism, see 68.35.Rh, and 75.40.-s, respectively)
• 75.40.-s: Critical-point effects, specific heats, short-range order(for equilibrium properties near critical points, see 64.60.F-; for dynamical critical phenomena, see 64.60.Ht)
• 64.90.+b: Other topics in equations of state, phase equilibria, and phase transitions (restricted to new topics in section 64)

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1994
• Volume: 85
• Issue: 1
• Pages: 145-163

Dates

published

1994-01

Contributors

author

A. Oleś

• Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland

author

J. Zaanen

• Lorentz Institute for Theoretical Physics, Leiden University, P.O.B. 9506, 2300 RA Leiden, The Netherlands

Identifiers

DOI

10.12693/APhysPolA.85.145