Modified Spin Wave Theory of the Bilayer Square Lattice Frustrated Quantum Heisenberg Antiferromagnet
Modified Spin Wave Theory of the Bilayer Square Lattice Frustrated Quantum Heisenberg Antiferromagnet
The ground state of the square lattice bilayer quantum antiferromagnet with nearest and next-nearest neighbour intralayer interaction is studied by means of the modified spin wave method. For weak interlayer coupling, the ground state is found to be always magnetically ordered while the quantum disordered phase appear for large enough …