Ring-exchange interaction in doubly degenerate orbital system
Strongly Correlated Electrons
2015-05-18 v1 Materials Science
Abstract
Ring-exchange (RE) interaction in Mott insulator with doubly degenerate orbitals is studied. Hamiltonian for the RE interaction is derived by the perturbational calculation. A remarkably weak RE interaction destroys the orbital order caused by the order-by-fluctuation mechanism in the nearest-neighbor exchange-interaction model. A long range order of magnetic octupole moment, i.e. complex orbital wave functions, appears. Competition between octupole and quadrupole interactions strongly suppresses ordered moments.
Cite
@article{arxiv.1002.0178,
title = {Ring-exchange interaction in doubly degenerate orbital system},
author = {Joji Nasu and Sumio Ishihara},
journal= {arXiv preprint arXiv:1002.0178},
year = {2015}
}
Comments
5 pages, 5 figures