Quadrupolar Order in Isotropic Heisenberg Models with Biquadratic Interaction

Details Quadrupolar Order in Isotropic Heisenberg Models with Biquadratic Interaction Quadrupolar Order in Isotropic Heisenberg Models with Biquadratic Interaction

2001-09-24

arxiv.org/abs/cond-mat/0109431v1

Phys. Rev. B 65, 052403 (2002)

Physics

Condensed Matter

Materials Science

4 pages 5 figures

Scientific paper

10.1103/PhysRevB.65.052403

Through Quantum Monte Carlo simulation, we study the biquadratic-interaction model with the SU(2) symmetry in two and three dimensions. The zero-temperature phase diagrams for the two cases are identical and exhibit an intermediate phase characterized by finite quadrupole moment, in agreement with mean-field type arguments and the semi-classical theory. In three dimensions, we demonstrate that the model in the quadrupolar regime has a phase transition at a finite temperature. In contrast to predictions by mean-field theories, the phase transition to the quadrupolar phase turns out to be of the second order. We also examine the critical behavior in the two marginal cases with the SU(3) symmetry.

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