Frustrated kagome-lattice bilayer quantum Heisenberg antiferromagnet

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.

18 pages, 12 figures

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Cited by in corpus (3)

• Breakdown of the thermodynamic limit in quantum spin and dimer models
• Quantum Heisenberg antiferromagnet in a field on the Tasaki square lattice
• Non-ergodic one-magnon magnetization dynamics of the kagome lattice antiferromagnet