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- W1569485793 abstract "We report the infrared reflectances R(ensuremath{nu},T) of ${mathrm{YBa}}_{2}$(${mathrm{Cu}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathit{M}}_{mathit{x}}$${)}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$ films (M=Zn and Ni) for frequencies 50 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$1000 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$ and temperatures T=10, 100, and 300 K. The ``best fit'' conductivities, ${mathrm{ensuremath{sigma}}}_{1}$(ensuremath{nu},10 K), for both Zn- and Ni-doped films show no clear evidence of superconductivity, i.e., the superconducting density of states is very gapless. This degree of gaplessness is consistent with the large penetration depths measured in the same films. It agrees with estimates based on the measured carrier scattering rate 1/ensuremath{tau} (10 K) and theories of d-wave superconductors. The carrier scattering rate 1/ensuremath{tau}(T) increases with dopant concentration x and with T; it does not change rapidly just below ${mathit{T}}_{mathit{c}}$ as in pure ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$. The plasma frequency ${mathrm{ensuremath{omega}}}_{mathit{p}}$=8500ifmmodepmelsetextpmfi{}500 ${mathrm{cm}}^{mathrm{ensuremath{-}}1}$, independent of dopant concentration and T, agrees with values obtained in pure ${mathrm{YBa}}_{2}$${mathrm{Cu}}_{3}$${mathrm{O}}_{7mathrm{ensuremath{-}}mathrm{ensuremath{delta}}}$." @default.
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- W1569485793 date "1994-06-01" @default.
- W1569485793 modified "2023-09-25" @default.
- W1569485793 title "Infrared study of superconductivity inYBa2(Cu1−xMx)3O7−δ(M=Zn and Ni)" @default.
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- W1569485793 doi "https://doi.org/10.1103/physrevb.49.15970" @default.
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