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- W1997976251 abstract "In this work we investigate the relevance of phonons for the superconductivity in ${mathrm{Na}}_{0.35}mathrm{Co}{mathrm{O}}_{2}∙1.3{mathrm{H}}_{2}mathrm{O}$. We measure phonon dispersion in this material as well as in the nonhydrated parent compound ${mathrm{Na}}_{0.7}mathrm{Co}{mathrm{O}}_{2}$ by inelastic x-ray scattering. The measured phonon dispersion along the $ensuremath{Gamma}text{ensuremath{-}}M$ direction shows a marked softening of Co-related optical phonon branches close to the Brillouin zone boundary, with hole doping. The phonon spectra, dispersion, and softening of Co-vibration modes are well reproduced by first-principles calculations. The critical temperature estimated from a phonon-mediated mechanism is much lower than the measured one, suggesting a nonconventional superconducting state in this material." @default.
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- W1997976251 date "2006-07-18" @default.
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- W1997976251 title "Phonon softening in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mi mathvariant=normal>Na</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi mathvariant=normal>Co</mml:mi><mml:msub><mml:mi mathvariant=normal>O</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mo>∙</mml:mo><mml:mi>y</mml:mi><mml:msub><mml:mi mathvariant=normal>H</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant=normal>O</mml:mi></mml:mrow></mml:math>: Implications for the …" @default.
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- W1997976251 doi "https://doi.org/10.1103/physrevb.74.020504" @default.
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