Spin nematics in frustrated spin-dimer systems with bilayer structure

  title={Spin nematics in frustrated spin-dimer systems with bilayer structure},
  author={Toshiya Hikihara and Takahiro Misawa and Tsutomu Momoi},
  journal={Physical Review B},
We study frustrated spin-1/2 dimer systems in two dimensions with a bilayer structure, where spins are ferromagnetically coupled in dimers. Our model includes frustrated two-spin exchange interactions as well as four-spin interaction. We pay particular attention to the spin nematic phase, which does not exhibit any magnetic (spin-dipole) order but has a spin-quadrupolar long-range order. Employing a perturbation calculation, a mean-field approximation, and a numerical many-variable variational… 
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