Abstract
We performed zero-field muon spin relaxation/rotation measurements on the electron-doped system Pr 1− x LaCe x Cu 1− y Zn y O 4 to study the impurity effect on spin correlations in both magnetic and superconducting phases. In the antiferromagnetic phase with x = 0.08, the Néel temperature T N decreases monotonically upon Zn substitution, while with approaching the superconducting boundary ( x = 0.10), the effect of Zn substitution on the suppression of T N becomes weak ( x = 0.08). In the superconducting phase, in contrast to the hole-underdoped system, suppression of superconductivity by Zn substitution neither enhance well-defined AF correlations nor induce it at least down to T = 6 K. The impurity effect is discussed from a viewpoint of dilution effect of the Zn on the Cu spin lattice.
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