How ice enables superconductivity in NaxCoO2 · yH2O by melting charge order: possibility of novel electric field effects

Charge ordering in doped CoO2 planes near the commensurate fillings x=14 and 13 are considered for NaxCoO2 · yH2O and suggested to be competitors to superconductivity, leading to the experimentally seen narrow superconducting dome bounded by commensurate doping: 14