Frustrated bilayer quantum magnets have attracted attention as flat-band spin systems with unconventional thermodynamic properties. We study the low-temperature properties of a frustrated honeycomb-lattice bilayer spin-21 isotropic (XXX) Heisenberg antiferromagnet in a magnetic field by means of an effective low-energy theory using exact diagonalizations and quantum Monte Carlo simulations. Our main focus is on the magnetization curve and the temperature dependence of the specific heat indicating a finite-temperature phase transition in high magnetic fields.
@article{arxiv.1706.07909,
title = {Frustrated honeycomb-lattice bilayer quantum antiferromagnet in a magnetic field},
author = {Taras Krokhmalskii and Vasyl Baliha and Oleg Derzhko and Jörg Schulenburg and Johannes Richter},
journal= {arXiv preprint arXiv:1706.07909},
year = {2018}
}