Magnetic properties and spin waves of bilayer magnets in a uniform field

Details Magnetic properties and spin waves of bilayer magnets in a uniform field Magnetic properties and spin waves of bilayer magnets in a uniform field

2001-04-19

arxiv.org/abs/cond-mat/0104356v3

Eur. Phys. J. B 23, 329 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

12 pages, 9 figs; added references; final version as published

Scientific paper

10.1007/s100510170052

The two-layer square lattice quantum antiferromagnet with spins 1/2 shows a zero-field magnetic order-disorder transition at a critical ratio of the inter-plane to intra-plane couplings. Adding a uniform magnetic field tunes the system to canted antiferromagnetism and eventually to a fully polarized state; similar behavior occurs for ferromagnetic intra-plane coupling. Based on a bond operator spin representation, we propose an approximate ground state wavefunction which covers all phases by means of a unitary transformation. The excitations can be efficiently described as independent bosons; in the antiferromagnetic phase these reduce to the well-known spin waves, whereas they describe gapped spin-1 excitations in the singlet phase. We compute the spectra of these excitations as well as the magnetizations throughout the whole phase diagram.

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