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Charge ordering in the electron-doped superconductor Nd <sub>2โ</sub> <i> <sub>x</sub> </i> Ce <i> <sub>x</sub> </i> CuO <sub>4</sub>
In cuprate high-temperature superconductors, an antiferromagnetic Mott insulating state can be destabilized toward unconventional superconductivity by either hole- or electron-doping. In addition to these two electronic phases there is now a copious amount of evidence that supports the presence of a charge ordering (CO) instability competing with superconductivity inside the โฆ