Cu-spin dynamics in the overdoped regime of La2-xSrxCu1-yZnyO4 probed by muon spin relaxation
Abstract
Muon-spin-relaxation measurements have been performed for the partially Zn-substituted La2-xSrxCu1-yZnyO4 with y=0-0.10 in the overdoped regime up to x=0.30. In the 3 % Zn-substituted samples up to x=0.27, exponential-like depolarization of muon spins has been observed at low temperatures, indicating Zn-induced slowing-down of the Cu-spin fluctuations. The depolarization rate decreases with increasing x and almost no fast depolarization of muon spins has been observed for x=0.30 where superconductivity disappears. The present results suggest that the dynamical stripe correlations exist in the whole superconducting regime of La2-xSrxCuO4 and that there is no quantum critical point at x~0.19.
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