Journal
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
Volume 417, Issue 3-4, Pages 150-156Publisher
ELSEVIER
DOI: 10.1016/j.physc.2004.11.015
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Charge ordering in doped CoO2 planes near the commensurate fillings x = 1/4 and 1/3 are considered for Na-x-CoO2.yH(2)O and suggested to be competitors to superconductivity, leading to the experimentally seen narrow superconducting dome bounded by commensurate doping: 1/4 < x < 1/3. Intercalated hydrogen bonded H2O network, by its enhanced dielectric constant, screen and frustrate local charge order condensation energy and replace a generic 'charge glass order' by superconductivity in the dome. An access to superconductivity and charge order, available through the new water channel, is used to predict novel effects such as 'Electrical Modulation of Superconductivity' and 'Electroresistance Effect'. (C) 2004 Elsevier B.V. All rights reserved.
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