The phase diagram of electron-doped La2−xCexCuO4−δ

H. Saadaoui (), Z. Salman, H. Luetkens, T. Prokscha, A. Suter, W. A. MacFarlane, Y. Jiang, K. Jin, R. L. Greene, E. Morenzoni and R. F. Kiefl ()
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H. Saadaoui: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
Z. Salman: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
H. Luetkens: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
T. Prokscha: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
A. Suter: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
W. A. MacFarlane: University of British Columbia
Y. Jiang: Center for Nanophysics and Advanced Materials, University of Maryland
K. Jin: Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences
R. L. Greene: Center for Nanophysics and Advanced Materials, University of Maryland
E. Morenzoni: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
R. F. Kiefl: University of British Columbia

Nature Communications, 2015, vol. 6, issue 1, 1-6

Abstract: Abstract Superconductivity is a striking example of a quantum phenomenon in which electrons move coherently over macroscopic distances without scattering. The high-temperature superconducting oxides (cuprates) are the most studied class of superconductors, composed of two-dimensional CuO2 planes separated by other layers that control the electron concentration in the planes. A key unresolved issue in cuprates is the relationship between superconductivity and magnetism. Here we report a sharp phase boundary of static three-dimensional magnetic order in the electron-doped superconductor La2−xCexCuO4−δ, where small changes in doping or depth from the surface switch the material from superconducting to magnetic. Using low-energy spin-polarized muons, we find that static magnetism disappears close to where superconductivity begins and well below the doping level at which dramatic changes in the transport properties are reported. These results indicate a higher degree of symmetry between the electron and hole-doped cuprates than previously thought.

Date: 2015
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DOI: 10.1038/ncomms7041

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