Ferromagnetism, antiferromagnetism, and the curious nematic phase of S=1 quantum spin systems.

  title={Ferromagnetism, antiferromagnetism, and the curious nematic phase of S=1 quantum spin systems.},
  author={Daniel Ueltschi},
  journal={Physical review. E, Statistical, nonlinear, and soft matter physics},
  volume={91 4},
  • D. Ueltschi
  • Published 9 June 2014
  • Physics
  • Physical review. E, Statistical, nonlinear, and soft matter physics
We investigate the phase diagram of S=1 quantum spin systems with SU(2)-invariant interactions, at low temperatures and in three spatial dimensions. Symmetry breaking and the nature of extremal states can be studied using random loop representations. The latter confirm the occurrence of ferro- and antiferromagnetic transitions and the breaking of SU(3) invariance. And they reveal the peculiar nature of the nematic extremal states which minimize ∑(x)(S(x)(I))(2). 

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