A.V. Sizanov

 

Spin nematic states in antiferromagnets containing ferromagnetic bonds

 

The majority of recent works devoted to spin nematic phases deal with either frustrated magnets or with those described by Hamiltonians with large non-Heisenberg terms. We show in the present study that non-frustrated antiferromagnets (AFs) containing ferromagnetic (FM) bonds can show nematic phases in strong magnetic field. Among particular spin systems discussed are a ladder with FM rungs, two AF layers coupled ferromagnetically, a chain containing alternating AF and FM bonds and an AF anisotropic spin-1 chain.