Journal
PHYSICAL REVIEW LETTERS
Volume 84, Issue 15, Pages 3422-3425Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.3422
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Doping the high-T-c superconductor YBa2Cu3O6.7 with 1.5% of nonmagnetic Zn impurities in CuO2 planes is shown to produce a considerable broadening of Cu-63 NMR spectra, as well as an increase of low-energy magnetic fluctuations detected in Cu-63 spin-lattice relaxation measurements. A model-independent analysis demonstrates that these effects are due to the development of staggered magnetic moments on many Cu sites around each Zn and that the Zn-induced moment in the bulk susceptibility might be explained by this staggered magnetization. Several implications of these enhanced antiferromagnetic correlations are discussed.
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