How Ice enables Superconductivity in Na_xCoO₂.yH₂O by melting charge order: Possibility of novel Electric Field Effects

2003/06/23 by G. Baskaran, Baskaran, G.
Physics and Astronomy · #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.48550/arxiv.cond-mat/0306569

5 pages of LaTex file, 4 figures in eps files; Invited Talk presented at the 7th International Conference on Materials and Mechanisms of Superconductivity and High Temperature Superconductors (M2S-Rio 2003), Brazil, 26-30 May 2003. Typos and few sentences corrected

Abstract

Charge ordering in doped \cob planes near the commensurate fillings x = 1/4 and 1/3 are considered for Na_x CoO₂.yH₂O 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 \em 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'.

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