Phys. Rev. Lett. 103, 047201 (2009) [4 pages]Impurity-Induced Magnetic Order in Low-Dimensional Spin-Gapped MaterialsReceived 6 March 2009; revised 29 May 2009; published 21 July 2009 We have studied the effect of nonmagnetic Zn impurities in the coupled spin ladder Bi(Cu1-xZnx)2PO6 using 31P NMR, muon spin resonance (μSR), 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. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.047201
DOI:
10.1103/PhysRevLett.103.047201
PACS:
75.10.Pq, 76.60.−k, 76.75.+i, 05.10.Cc
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