Absence of the impurity-induced magnetic order in the electron-doped high-Tc cuprates Pr0.86LaCe0.14Cu1−y(Zn,Ni)yO4

Abstract

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+α-δ with y = 0, 0.01, 0.02, 0.05 and different values of the reduced oxygen content δ (δ ≦ 0.09). For the samples with y = 0 and very small δ values of δ < 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≦δ≦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.

Muon spin relaxation study of the Cu spin dynamics in electron-doped high-TcsuperconductorPr0.86LaCeRisdiana1, Adachi2, Oki3 et al. 2010Phys. Rev. BSelf Cite361250View full textAdd to dashboardCite

“…11 In this paper, we investigate Zn-impurity effects on the Cu-spin dynamics in the electron-doped high-T c superconductor Pr 0.86 LaCe 0.14 Cu 1−y Zn y O 4+␣−␦ with y = 0 -0.05 and the reduced oxygen content ␦ = 0 -0.09 from the ZF-and longitudinal-field ͑LF͒ SR measurements, in order to elucidate whether or not the concept of the pinning of the dynamical stripe correlations by Zn holds good in the electrondoped system. 12,13 …”

μSR study of the Cu-spin dynamics in the electron-doped high-Tc cuprate of Pr0.86LaCe0.14Cu1−(Zn,Ni) O4

“…Polycrystalline samples of Pr 0.86 LaCe 0.14 Cu 1Ày (Zn,Ni) y O 4+aÀd with y ¼ 0, 0.01, 0.02 and 0.05 were prepared by the ordinary solid-state reaction method from La 2 O 3 , Pr 6 O 11 , CeO 2 , CuO and ZnO or NiO powders of high purity [6,7]. As-grown samples were post-annealed in flowing Ar gas of high purity (6 N) at 950 1C for 10 h in order to remove the excess oxygen.…”

“…Here, we have investigated the Zn-and Ni-substitution effects on the Cu-spin dynamics in the electron-doped Pr 0.86 LaCe 0.14 Cu 1Ày (Zn,Ni) y O 4+aÀd from muon-spin-relaxation (mSR) measurements, changing y up to 0.05 and d up to 0.09 [6].…”

Magnetic and Superconducting Phase Diagram of Electron-Doped Eu_2-xCe_xCuO_4+α-δ

“…Unlike the hole-doped system that a lot of researchers reported various properties [2][3][4][5][6][7], research on electron-doped superconducting is still difficult to conduct [8][9][10][11][12][13][14][15][16]. One of the reasons is the difficulty in controlling the oxygen content in the material.…”