title: Impurity-induced magnetic order in low-dimensional spin-gapped materials.
abstract: We have studied the effect of nonmagnetic Zn impurities in the coupled spin ladder Bi(Cu_{1-x}Zn_{x})_{2}PO_{6} using ;{31}P NMR, muon spin resonance (microSR), and quantum Monte Carlo simulations. Our results show that the impurities induce in their vicinity antiferromagnetic polarizations, extending over a few unit cells. At low temperature, these extended moments freeze in a process which is found universal among various other spin-gapped compounds: isolated ladders, Haldane, or spin-Peierls chains. This allows us to propose a simple common framework to explain the generic low-temperature impurity-induced freezings observed in low-dimensional spin-gapped materials.
authors: Laboratoire de Physique des Solides, Université Paris-Sud, UMR-8502 CNRS, 91405 Orsay, France.
authors: J
authors: J
authors: Bobroff
authors: N
authors: N
authors: Laflorencie
authors: L K
authors: LK
authors: Alexander
authors: A V
authors: AV
authors: Mahajan
authors: B
authors: B
authors: Koteswararao
authors: P
authors: P
authors: Mendels