title: Charge ordering in the electron-doped superconductor Nd(2-x)Ce(x)CuO₄.
abstract: In cuprate high-temperature superconductors, an antiferromagnetic Mott insulating state can be destabilized toward unconventional superconductivity by either hole or electron doping. In hole-doped (p-type) cuprates, a charge ordering (CO) instability competes with superconductivity inside the pseudogap state. We report resonant x-ray scattering measurements that demonstrate the presence of charge ordering in the n-type cuprate Nd(2-x)Ce(x)CuO4 near optimal doping. We find that the CO in Nd(2-x)Ce(x)CuO4 occurs with similar periodicity, and along the same direction, as in p-type cuprates. However, in contrast to the latter, the CO onset in Nd(2-x)Ce(x)CuO4 is higher than the pseudogap temperature, and is in the temperature range where antiferromagnetic fluctuations are first detected. Our discovery opens a parallel path to the study of CO and its relationship to antiferromagnetism and superconductivity.
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada. Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada. Max Planck Institute for Solid State Research, D-70569 Stuttgart, Germany. Quantum Materials Program, Canadian Institute for Advanced Research, Toronto, Ontario M5G 1Z8, Canada. ehda@physics.ubc.ca damascelli@physics.ubc.ca.
authors.forename: Eduardo H
authors.initials: EH
authors.lastname: da Silva Neto
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada. Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: Riccardo
authors.initials: R
authors.lastname: Comin
authors.affiliation: Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada.
authors.forename: Feizhou
authors.initials: F
authors.lastname: He
authors.affiliation: Canadian Light Source, Saskatoon, Saskatchewan S7N 2V3, Canada.
authors.forename: Ronny
authors.initials: R
authors.lastname: Sutarto
authors.affiliation: Center for Nanophysics and Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA.
authors.forename: Yeping
authors.initials: Y
authors.lastname: Jiang
authors.affiliation: Center for Nanophysics and Advanced Materials and Department of Physics, University of Maryland, College Park, MD 20742, USA.
authors.forename: Richard L
authors.initials: RL
authors.lastname: Greene
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada. Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada.
authors.forename: George A
authors.initials: GA
authors.lastname: Sawatzky
authors.affiliation: Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada. Quantum Matter Institute, University of British Columbia, Vancouver, British Columbia V6T 1Z4, Canada. ehda@physics.ubc.ca damascelli@physics.ubc.ca.
authors.forename: Andrea
authors.initials: A
authors.lastname: Damascelli