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Frustrated kagome-lattice bilayer quantum Heisenberg antiferromagnet

Dmytro Yaremchuk1,2,*, Taras Hutak1,†, Vasyl Baliha1,3, Taras Krokhmalskii1, Oleg Derzhko1,4,5,‡, Jürgen Schnack4, and Johannes Richter6

  • *Contact author: yaremchuk@icmp.lviv.ua
  • †Contact author: t.hutak@icmp.lviv.ua
  • ‡Contact author: derzhko@icmp.lviv.ua

Phys. Rev. B 112, 024402 – Published 1 July, 2025

DOI: https://doi.org/10.1103/1rzb-s69p

Abstract

We consider the S=1/2 antiferromagnetic Heisenberg model on a frustrated kagome-lattice bilayer with strong nearest-neighbor interlayer coupling and examine its low-temperature magnetothermodynamics using a mapping onto a rhombi gas on the kagome lattice. Besides, we use finite-size numerics to illustrate the validity of the classical lattice-gas description. Among our findings there are (i) the absence of an order-disorder phase transition and (ii) the sensitivity of the specific heat at low temperatures to the shape of the system just below the saturation magnetic field even in the thermodynamic limit.

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