Physics – Condensed Matter – Superconductivity
Scientific paper
2004-12-15
Physica C 426-431 (2005) 355-359
Physics
Condensed Matter
Superconductivity
13 pages, 2 figures, Proceedings of ISS2004 (to be published in Physica C)
Scientific paper
10.1016/j.physc.2005.02.046
Zero-field muon-spin-relaxation measurements have been carried out in order to investigate the Zn- and Ni-substitution effects on the Cu-spin dynamics in the electron-doped Pr_0.86_LaCe_0.14_Cu_1-y_(Zn, Ni)_y_O_4+\alpa-\delta_ with y = 0, 0.01, 0.02, 0.05 and different values of the reduced oxygen content \delta(\delta \le 0.09). For the samples with y = 0 and very small \delta values of \delta < 0.01, a muon-spin precession due to the formation of a long-range antiferromagnetic order has been observed at low temperatures below \~ 5 K. For the moderately oxygen-reduced samples of 0.01 \le \delta \le 0.09, on the contrary, no muon-spin precession has been observed and the temperature dependence of the spectra is similar to one another regardless of the y value. That is, no impurity-induced slowing down of the Cu-spin fluctuations has been detected, which is very different from the results of the hole-doped high-T_c_ cuprates. The reason is discussed.
Adachi Tadashi
Koike Yuji
Nagamine Kentaro
Risdiana
Watanabe Isao
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