Low-temperature magnetization curves and thermodynamics of a spin-1/2 Heisenberg octahedral chain with the intraplaquette and monomer-plaquette interactions are examined within a two-component lattice-gas model of hard-core monomers, which takes into account all low-lying energy modes in a highly frustrated parameter space involving the monomer-tetramer, localized many-magnon and fully polarized ground states. It is shown that the developed lattice-gas model satisfactorily describes all pronounced features of the low-temperature magnetization process and the magneto-thermodynamics such as abrupt changes of the isothermal magnetization curves, a double-peak structure of the specific heat or a giant magnetocaloric effect.
@article{arxiv.1706.06370,
title = {Magnetization process and low-temperature thermodynamics of a spin-1/2 Heisenberg octahedral chain},
author = {Jozef Strecka and Johannes Richter and Oleg Derzhko and Taras Verkholyak and Katarina Karlova},
journal= {arXiv preprint arXiv:1706.06370},
year = {2018}
}
Comments
6 pages, 3 figures, contribution to SCES2017 conference