title: 63Cu nuclear magnetic resonance study of Pr(1.85)Ce(0.15)Cu(1-x)Ni(x)O(4): Ni-induced spin density oscillation and modification of the low energy spin fluctuations.
abstract: We report the results from a (63)Cu nuclear magnetic resonance (NMR) study of the electron-doped high temperature superconducting cuprate (HTSC) Pr(1.85)Ce(0.15)Cu(1-x)Ni(x)O(4). We find that Ni induces a magnetic broadening of the (63)Cu NMR spectra that can be interpreted in terms of an induced spin density oscillation about the Ni site, similar to that reported from (63)Cu NMR measurements on the hole-doped HTSCs when Zn is partially substituted for Cu. There is also an additional temperature-dependent contribution to the (63)Cu spin-lattice relaxation rate that can be interpreted in terms of an Ni-induced modification of the low energy spin fluctuations. Furthermore, the spin fluctuations are intrinsically spatially inhomogeneous and additional inhomogeneities are induced by Ni.
authors.affiliation: The MacDiarmid Institute, Industrial Research, PO Box 31310, Lower Hutt 5040, New Zealand. g.williams@irl.cri.nz
authors.forename: G V M
authors.initials: GV
authors.lastname: Williams
authors.forename: M
authors.initials: M
authors.lastname: Jurkutat
authors.forename: D
authors.initials: D
authors.lastname: Rybicki
authors.forename: J
authors.initials: J
authors.lastname: Haase
mesh_terms: D003300:Copper / Q000032:analysis*; D004553:Electric Conductivity; D007554:Isotopes / Q000032:analysis; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008670:Metals / Q000737:chemistry*; D013113:Spin Labels
chemical_list: D007554:Isotopes; D008670:Metals; D013113:Spin Labels; D003300:Copper