Muon-spin-relaxation (μSR) measurements have been performed for the partially Zn-substituted electron-doped high- Tc superconductor Pr 0.86 LaCe0.14 Cu1-y ZnyO 4+α-δ with y=0-0.05 and the reduced oxygen content δ=0-0.09, in order to investigate nonmagnetic Zn-impurity effects on the Cu-spin dynamics. For all the measured samples with 0.01≤δ≤0.09, it has been found that a fast depolarization of muon spins is observed below 100 K due to the effect of Pr3+ moments and that the μSR time spectrum in the long-time region above 5 μsec increases with decreasing temperature at low temperatures below 30 K possibly due to slowing down of the Cu-spin fluctuations assisted by Pr3+ moments. No Zn-induced slowing down of the Cu-spin fluctuations has been observed for moderately oxygen-reduced samples with 0.04≤δ≤0.09, which is very different from the μSR results of La2-x Srx Cu1-y Zny O 4. The possible reason may be that there are no dynamical stripe correlations of spins and electrons in the electron-doped high- Tc cuprates or that the effect of Pr3+ moments on the μSR spectra is stronger than that of a small amount of Zn impurities.
|ジャーナル||Physical Review B - Condensed Matter and Materials Physics|
|出版ステータス||Published - 2010 7月 7|
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