Destruction of long-range order in noncollinear two-dimensional antiferromagnets by random-bond disorder

摘要: We consider frustrated Heisenberg antiferromagnets, whose clean-limit ground state is characterized by noncollinear long-range order with nonzero vector chirality, and study the effects of quenched bond disorder, i.e., random exchange couplings. A single defect known to induce a dipolar texture in spin background independent microscopic details. Using general analytical arguments as well large-scale simulations for classical triangular-lattice model, we show that any finite concentration such defects destroys spatial dimension $d\ensuremath{\le}2$, favor glassy correlation length $d=2$ exponentially large small randomness. Our results are relevant wide range layered magnets.