Phys. Rev. B 76, 224503 (2007) [5 pages]Paramagnonlike excitations and spin diffusion in magnetic resonance studies of copper oxide superconductorsReceived 15 June 2007; revised 16 October 2007; published 5 December 2007 The relaxation function theory for a doped two-dimensional Heisenberg antiferromagnetic system in the paramagnetic state for all wave vectors through the Brillouin zone is presented in view of the low frequency response of high-Tc copper oxide superconductors. We deduced the regions of long lifetime [T≲400(1−4x) K] and “overdamped” [T≳700(1−4x) K] paramagnonlike excitations in the temperature (T)-doping index (x) phase diagram from plane oxygen nuclear spin-lattice relaxation rate 17(1∕T1) data right up to optimally doped La2−xSrxCuO4, thus providing the regimes for the spin-wave concept and the overdamped mode. © 2007 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.76.224503
DOI:
10.1103/PhysRevB.76.224503
PACS:
74.72.−h, 75.40.Gb, 74.25.Ha, 71.27.+a
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