Superconductivity in NaxCoO2·yH2O: protection of a d1+id2 state by spin-charge separation

Sa, Debanand ; Sardar, Manas ; Baskaran, G. (2004) Superconductivity in NaxCoO2·yH2O: protection of a d1+id2 state by spin-charge separation Physical Review B, 70 (10). 104505_1-104505_5. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v70/i10/e104505

Related URL: http://dx.doi.org/10.1103/PhysRevB.70.104505

Abstract

Superconductivity in NaxCoO2·yH2O is likely to be a p or d wave; however, experiments are unable to pinpoint the symmetry. A simple estimate of pair breaking effects from an unavoidable "Na+ vacancy disorder"in an ordered Na+ lattice, at an optimal xopt≈0.30 is shown to destroy a Fermi liquid-based p- or d-wave superconductivity. However, a robustness of superconducting and normal states, seen in experiments, is pointed out and argued to imply the presence of a "quantum protectorate,"possibly a spin-charge decoupling that protects a d1+id2 and not a p state. A calculation of Knight shift and 1/T1 in the framework of resonating valence bond mean-field theory and a fit to the data of Kobayashi et al.

Item Type:Article
Source:Copyright of this article belongs to American Physical Society.
Keywords:Nonconventional Mechanisms; Pairing Symmetries; Chemical and Knight Shifts
ID Code:1926
Deposited On:08 Oct 2010 11:29
Last Modified:16 May 2011 09:47

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