Abstract
We show that spin- chains with SU(2)-symmetric, ferromagnetic nearest-neighbor and frustrating antiferromagnetic next-nearest-neighbor exchange interactions exhibit metamagnetic behavior under the influence of an external magnetic field for small , in the form of a first-order transition to the fully polarized state. The corresponding magnetization jump increases gradually starting from an -dependent critical value of exchange couplings and takes a maximum in the vicinity of a ferromagnetic Lifshitz point. The metamagnetism results from resonances in the dilute magnon gas caused by an interplay between quantum fluctuations and frustration.
1 More- Received 22 November 2011
DOI:https://doi.org/10.1103/PhysRevB.84.224409
©2011 American Physical Society