Nematic order in square lattice frustrated ferromagnets.

نویسندگان

  • Nic Shannon
  • Tsutomu Momoi
  • Philippe Sindzingre
چکیده

We present a new scenario for the breakdown of ferromagnetic order in a two-dimensional quantum magnet with competing ferromagnetic and antiferromagnetic interactions. In this, dynamical effects lead to the formation of two-magnon bound states, which undergo Bose-Einstein condensation, giving rise to bond-centered nematic order. This scenario is explored in some detail for an extended Heisenberg model on a square lattice. In particular, we present numerical evidence confirming the existence of a state with d-wave nematic correlations but no long-range magnetic order, lying between the saturated ferromagnetic and collinear antiferromagnetic phases of the ferromagnetic model J1-J2. We argue by continuity of spectra that this phase is also present in a model with 4-spin cyclic exchange.

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عنوان ژورنال:
  • Physical review letters

دوره 96 2  شماره 

صفحات  -

تاریخ انتشار 2006