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- W2073308527 abstract "Abstract The optical reflectivity of YBa 2 Cu 4 O 8 single crystals has been measured at room temperature for light polarized along the crystallographic a - and b -directions. A fit with Lorentz and Drude terms gives a 2.8 times larger quotient of the free carrier density divided by the effective mass and an 1.7 times smaller damping for light polarized along b than along a . The electrical resistivity has an a - b anisotropy of at least a factor 2.8. Its temperature dependence shows saturation effects above 200 K, indicating that the mean free path is comparable to the nearest neighbor distance. Assuming electron-phonon scattering the combination of the plasma frequencies and the temperature derivatives of the resistivity leads to values of ∼- 3.5 for the electron-phonon coupling constant raising the question whether YBa 2 Cu 4 O 8 is a strong coupling superconductor. In a second part of the paper the broadening of the superconducting transition in fields up to 10 T is reported." @default.
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- W2073308527 date "1990-10-01" @default.
- W2073308527 modified "2023-09-27" @default.
- W2073308527 title "YBa2Cu4O8: A strong coupling high-Tc superconductor?" @default.
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- W2073308527 doi "https://doi.org/10.1016/0022-5088(90)90198-s" @default.
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