Phase Transitions of the Bilayered Spin-S Heisenberg Model and Its Extension to Fractional Dimensions

Details Phase Transitions of the Bilayered Spin-S Heisenberg Model and Its Extension to Fractional Dimensions Phase Transitions of the Bilayered Spin-S Heisenberg Model and Its Extension to Fractional Dimensions

1995-11-14

arxiv.org/abs/cond-mat/9511070v1

Physics

Condensed Matter

14 pages, 7 Postscript figures, LaTeX

Scientific paper

We study the ground state and the phase transitions of the bilayered spin-$S$ antiferromagnetic Heisenberg model using the Schwinger boson mean field theory. The interplane coupling initially stabilizes but eventually destroys the long-range antiferromagnetic order. The transition to the disordered state is continuous for small $S$, and first order for large $S$. The latter is consistent with an argument based on the spin wave theory. The phase diagram and phase transitions in corresponding model in fractional dimensions are also discussed.

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