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- W2090922892 abstract "We propose a band structure for a triangular lattice with nearest-neighbor hopping in terms of changing tight binding parameters, α1 and β1, to be the lattice representation of the compound NaxCoO2yH2O (sodium cobalt oxyhydrate), which is superconducting at a critical temperature of Tc≈5 K. We have calculated Tc and μ versus ρ curves (where ρ is the number of carriers) for several values of α1 and β1 distorting, in this way, the geometry of the original lattice. By doing this we have verified that all the Tc maxima are related, one-to-one, to the logarithmic singularities which appear in the free density of states N(ω) versus ω plots. Similarities and differences with respect to the s- and d-wave symmetry cases are also discussed. We have also calculated the isotope exponent α as a function of ρ for several values of α1 and β1. We have found that the α versus ρ curve, for , changes non-monotonically. Experimental tests of the isotope exponent are called for to verify the validity of this theoretical prediction. We conclude that the d-wave symmetry is not compatible with the experimental phase diagram of this compound." @default.
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- W2090922892 date "2009-06-23" @default.
- W2090922892 modified "2023-09-25" @default.
- W2090922892 title "Superconductivity and the isotope exponent versus the number of carriers in a changing hopping triangular lattice" @default.
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- W2090922892 doi "https://doi.org/10.1088/0953-2048/22/7/075027" @default.
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