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  Wilson, S.D.; Yamani, Z.; Dhital, C.; Freelon, B.; Freeman, P. G.; Fernandez-Baca, J. A.; Yamada, K.; Wakimoto, S.; Buyers, W. J. L.; Birgeneau, R. J.: Zn-induced spin dynamics in overdoped La_2-xSr_xCu_1-yZn_yO₄. Physical Review B 85 (2012), p. 014507-9

10.1103/PhysRevB.85.014507

Abstract:
Spin fluctuations and the local spin susceptibility in isovalently Zn-substituted La2−xSrxCu1−yZnyO4 (x=0.25, y≈0.01) are measured via inelastic neutron-scattering techniques. As Zn2+ is substituted onto the Cu2+-sites, an anomalous enhancement of the local spin susceptibility χ′′(ω) appears due to the emergence of a commensurate antiferromagnetic excitation centered at wave vector Q =(π,π,0) that coexists with the known incommensurate spin-density wave excitations at QHK=(π±δ,π),(π,π±δ). Our results support a picture of Zn-induced antiferromagnetic (AF) fluctuations appearing through a local staggered polarization of Cu2+ spins, and the simultaneous suppression of Tc as AF fluctuations are slowed in proximity to Zn impurities suggests the continued importance of high-energy AF fluctuations at the far overdoped edge of superconductivity in the cuprates.