Universal Magnetic Fragmentation in Frustrated Magnets

Fragmentation of degrees of freedom appearing in some many-body systems shows rich physics and gives rise to interesting concepts. Magnetic fragmentation has been recently predicted theoretically and observed in experiments in certain frustrated magnets. Theoretically fragmentation requires fine-tuned models in most cases. We demonstrate based on several frustrated models, that fragmentation is much more universal. Monte-Carlo simulations and spin-wave calculations show that once a model featuring a Coulomb phase is perturbed and an ordered phase emerges, one still observes simultaneously the Bragg peaks associated to the ordered phase and the pinch point patterns in the structure factor.