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29 November 2021
 
  » arxiv » cond-mat/0505228

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Superconductivity in Na$_{x}$CoO$_{2}cdot y$H$_{2}$O driven by the kinetic energy
Bin Liu ; Ying Liang ; Shiping Feng ;
Date 10 May 2005
Journal In Proceedings of the Fifth International Conference on New Theories, Discoveries and Applications of Superconductors and Related Materials, Chongqing, China, 2004, edited by J.D. Fan, J. Gao, Y.M. Malozovsky, W.L. Wang, H. Zhang, B.R. Zhao and Y. Zhao
Subject Superconductivity; Strongly Correlated Electrons | cond-mat.supr-con cond-mat.str-el
AbstractWithin the charge-spin separation fermion-spin theory, the mechanism of superconductivity in Na$_{x}$CoO$_{2}cdot y$H$_{2}$O is studied. It is shown that dressed fermions interact occurring directly through the kinetic energy by exchanging magnetic excitations. This interaction leads to a net attractive force between dressed fermions(then the electron Cooper pairs), and their condensation reveals the superconducting ground state. The optimal superconducting transition temperature occurs in the electron doping concentration $deltaapprox 0.29$, and then decreases for both underdoped and overdoped regimes, in qualitative agreement with the experimental results.
Source arXiv, cond-mat/0505228
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