Locallized Magnetism in Low-Dimensional Systems
Abstract
The current theoretical and experimental situation is reviewed for low-dimensional (layered and chain-like) insulating systems. Such systems possess a low magnetic transition temperature and pronounced short-range magnetic order above this temperature. Both the standard and self-consistent spin-wave theories are shown to be insufficient to quantitatively describe the experimental data on these systems. Field-theoretical approaches taking into account the contribution of the spin-fluctuation excitations (neglected in the spin-wave theories) to the thermodynamic properties of ferro- and antiferromagnets are discussed. Analytical expressions for and temperature dependences of long-range order paramenters are obtained, which are in a fair agreement with experimental data.
Cite
@article{arxiv.2102.08130,
title = {Locallized Magnetism in Low-Dimensional Systems},
author = {A. A. Katanin and V. Yu. Irkhin},
journal= {arXiv preprint arXiv:2102.08130},
year = {2021}
}
Comments
In Russian, 59 p. Book Chapter in: Physics of Magnetic Materials and Nanostructures (Ekaterinburg, 2020), p.456. Extended and updated version of the paper Physics-Uspekhi 50, 613 (2007)