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Journal Article

Extended s-wave pairing originating from the a1g band in NaxCoO2·yH2O: Single-band U-V model with fluctuation exchange method

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Arita,  R.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Kuroki, K., Onari, S., Tanaka, Y., Arita, R., & Nojima, T. (2006). Extended s-wave pairing originating from the a1g band in NaxCoO2·yH2O: Single-band U-V model with fluctuation exchange method. Physical Review B, 73(18): 184503.


Cite as: https://hdl.handle.net/21.11116/0000-000E-FBE4-6
Abstract
Motivated by recent experiments and band calculation results, we
investigate the possibility of superconductivity originating from the
a(1g) band of NaxCoO2 center dot yH(2)O assuming the absence of e(g)(')
pockets. We adopt a single band U-V model that takes into account the
local minimum of the a(1g) band dispersion at the Gamma point. Using
the fluctuation exchange method, we find that an unconventional s-wave
pairing with a gap that changes sign between the inner and the outer
Fermi surfaces is enhanced due to the coexistence of spin fluctuations
at wave vectors bridging the two Fermi surfaces and the charge
fluctuations near the K point. Possible relevance to the experimental
results is discussed.