Phys. Rev. Lett. 85, 1982–1985 (2000)Crossover from Dilute to Majority Spin Freezing in Two Leg Ladder System Sr(Cu,Zn)2O3Received 15 September 1999; revised 16 March 2000; published in the issue dated 28 August 2000 Muon spin relaxation has been measured in Sr(Cu1-xZnx)2O3. The results for low Zn concentration x≤0.6% are consistent with freezing of dilute moments, with one Cu spin for each Zn, having ∼0.5μB frozen moment. A sharp increase of the relaxation rate at T→0 occurred with increasing x around x≃0.8%, accompanied by a change of line shape to that expected in a concentrated magnetic environment. Analyses of the results for x≥0.8% suggest that the majority of Cu moments participate in spin freezing, yet with a significantly reduced and spatially inhomogeneous moment size having a 1D correlation length ξ∼6 lattice units, or a 2D correlation area involving ∼19 Cu spins. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.85.1982
DOI:
10.1103/PhysRevLett.85.1982
PACS:
75.20.Hr, 75.30.Hx, 75.40.Cx, 76.75.+i
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