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- W1998424710 abstract "The thermal conductivity ensuremath{kappa} of dense sintered ceramic ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{4}$${mathrm{O}}_{8}$ in the range 30--310 K has been measured. At 100 K, ensuremath{kappa} is 10 W ${mathrm{m}}^{mathrm{ensuremath{-}}1}$ ${mathrm{K}}^{mathrm{ensuremath{-}}1}$, approaching the in-plane ensuremath{kappa} of single crystals of other high-${mathit{T}}_{mathit{c}}$ materials. ensuremath{kappa} decreases rapidly with increasing T to 7.4 W ${mathrm{m}}^{mathrm{ensuremath{-}}1}$ ${mathrm{K}}^{mathrm{ensuremath{-}}1}$ at 300 K. Fitting standard models for ensuremath{kappa}(T) to the data we find that ensuremath{kappa} is limited mainly by phonon-phonon interactions. Depending on the model used, the best fit is found for effective values of ${mathit{FTHETA}}_{mathrm{Debye}}$ between 155 and 185 K, characteristic for the acoustic phonon branches, indicating that such phonons carry most of the heat. Finally, we suggest a possible way to test the electron-phonon model for the electrical and thermal conductivities in high-${mathit{T}}_{mathit{c}}$ materials." @default.
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- W1998424710 date "1993-08-01" @default.
- W1998424710 modified "2023-09-27" @default.
- W1998424710 title "Thermal conductivity ofYBa2Cu4O8dominated by phonon-phonon interactions" @default.
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- W1998424710 doi "https://doi.org/10.1103/physrevb.48.3575" @default.
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