The S=1/2 Heisenberg antiferromagnet on the Tasaki square lattice exhibits an order-disorder phase transition belonging to the 2D Ising universality class just below the saturation magnetic field.
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Quantum Heisenberg antiferromagnet in a field on the Tasaki square lattice
The S=1/2 Heisenberg antiferromagnet on the Tasaki square lattice exhibits an order-disorder phase transition belonging to the 2D Ising universality class just below the saturation magnetic field.