(1) Pohl Institute of Solid State Physics, Tongji University, Shanghai, 200092, P.R. China
Abstract:
We numerically investigate an S=1/2 spin model, in which two dimerized antiferromagnetic rings interact with each other ferromagnetically. It is shown that the order of the magnetoelastic transition is strongly affected by the interring coupling J⊥ and there may exist a critical J⊥* dividing the first-order transition and the continuous transition.