Intermediate spin and quantum critical points, etc

Details Intermediate spin and quantum critical points, etc Intermediate spin and quantum critical points, etc

1999-01-21

arxiv.org/abs/cond-mat/9901219v1

Physics

Condensed Matter

Statistical Mechanics

17 pages, including one figure

Scientific paper

Unlike that of SO(3) or SU(2), the Lie algebra for SO(2), which defines intermediate spin, comprises only $S_{z}$ and implies $S^{\pm}$ commute. In general, $S_{z}$ has a continuous spectrum. This intermediate spin scheme can realized for the low energy excitations of a wide class of large spin magnets. A magnetic field provides the necessary time reversal symmetry breaking and controls the effective value of the spin $\tilde S$. Physical quantities are periodic in the equilibrium magnetization component induced by this field. In particular for one dimensional antiferromagnets there are periodic regions on the field axis for which the model is quantum critical while in two or three dimensions criticality is reduced to points.

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