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Journal of Superconductivity and Novel Magnetism

, Volume 26, Issue 8, pp 2685–2688 | Cite as

Charge Inhomogeneity in Electron-Doped Pr1.85Ce0.15CuO4 Determined with 63Cu NMR

  • Michael Jurkutat
  • Jürgen Haase
  • Andreas Erb
Original Paper

Abstract

Nuclear Magnetic Resonance (NMR) of Cu and O has been applied successfully to probe locally the charge distribution in the CuO2 plane of the hole-doped cuprates. However, for the electron-doped systems, only insufficient Cu NMR data are available. Here, with a set of new 63Cu NMR experiments including double-resonance experiments, we examine the quadrupole interaction for a single crystal of Pr1.85Ce0.15CuO4. From the data, we deduce that the doped electrons mainly enter the Cu \(3\mathrm{d}_{x^{2}-y^{2}}\) orbital resulting in an almost vanishing electric field gradient. In addition, we observe a substantial variation across the CuO2 plane that, however, remains largely axially symmetric. We estimate 13 % doped carriers at 15 % nominal doping with a charge density variation of at least 4 % for this optimally doped sample.

Keywords

NMR Electron-doped cuprate Double-resonance 

Notes

Acknowledgements

We acknowledge the financial support from the University of Leipzig and the DFG within the Graduate School Build-MoNa and ESF project No. 080939247, support by FOR538, help of D. Rybicki and G.V.M. Williams, and discussions with O.P. Sushkov.

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Copyright information

© Springer Science+Business Media New York 2013

Authors and Affiliations

  1. 1.Faculty of Physics and Earth SciencesUniversity of LeipzigLeipzigGermany
  2. 2.Walther-Meissner-Institute for Low Temperature ResearchGarchingGermany

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