Dynamical mean-field study of model double-exchange superlattices

Dynamical mean-field theory of nickelate superlattices.

Dynamical mean-field methods are used to calculate the phase diagram, many-body density of states, relative orbital occupancy, and Fermi-surface shape for a realistic model of LaNiO(3)-based superlattices. The model is derived from density-functional band calculations and includes oxygen orbitals. The combination of the on-site Hunds interaction and charge transfer between the transition metal ...

Variational mean-field approach to the double-exchange model

J. L. Alonso, L. A. Fernández, F. Guinea, V. Laliena, and V. Martı́n-Mayor Departamento de Fı́sica Teórica, Facultad de Ciencias, Universidad de Zaragoza, 50009 Zaragoza, Spain Departamento de Fı́sica Teórica, Facultad de C. C. Fı́sicas, Universidad Complutense de Madrid, 28040 Madrid, Spain Instituto de Ciencia de Materiales (CSIC), Cantoblanco, 28049 Madrid, Spain Dipartimento di Fisica, Universi...

Spin and orbital exchange interactions from Dynamical Mean Field Theory

We derive a set of equations expressing the parameters of the magnetic interactions characterizing a strongly correlated electronic system in terms of singleelectron Green’s functions and self-energies. This allows to establish a mapping between the initial electronic system and a spin model including up to quadratic interactions between the effective spins, with a general interaction (exchange...

Dynamical mean-field theory

Dynamical Mean Field and Dynamical Cluster Approximations

We present a pedagogical discussion of the dynamical mean field and dynamical cluster approximations. PACS: ...