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• W2070677268 abstract "Electrical conductivity and thermoelectric power (TEP) of the as-quenched and annealed (at 500 ifmmode^circelsetextdegreefi{}C for 10 h and 840 ifmmode^circelsetextdegreefi{}C for 24 h) ${mathrm{Bi}}_{4ensuremath{-}n}{mathrm{Pb}}_{n}{mathrm{Sr}}_{3}{mathrm{Ca}}_{3}{mathrm{Cu}}_{4}{mathrm{O}}_{x} (x=0ensuremath{-}1.0)$ glasses have been measured. The dc conductivity data of the as-quenched and the partially annealed (at 500 ifmmode^circelsetextdegreefi{}C) glasses can be explained by considering the small-polaron hopping conduction mechanism which is found to change from the nonadiabatic to the adiabatic regime with annealing the glasses at 500 ifmmode^circelsetextdegreefi{}C. This change over is due to the presence of microcrystals in the partially annealed glasses as observed from x-ray-diffraction and scanning electron microscopic studies. This adiabatic behavior is also visualized even for some as-quenched glasses having a very small amount of the more conducting microcrystalline phase. All the 840 ifmmode^circelsetextdegreefi{}C annealed glasses are superconductors with ${T}_{c}$ between 110 and 115 K. The Seebeck coefficient ($S$) of the partially annealed glass system is found to be positive and increases linearly with temperature. The $S$ values of the corresponding glass-ceramic superconductors showing broad peaks around ${T}_{c}$. A change over in the values of $S$ from positive (below ensuremath{sim}290 K) to negative (above ensuremath{sim}290 K) indicates the coexistence of both electrons and holes in these superconductors. The TEP data can be fitted with both the two-band model of Forro et al. [Solid State Commun. 73, 501 (1990)] and the Nagaosa-Lee model [Phys. Rev. Lett. 64, 2450 (1990)]. Therefore, the bosonic contribution in the transport properties of these superconductors, as suggested by the Nagaosa-Lee model, is supported." @default.
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• W2070677268 title "Transport properties of Pb-doped<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Bi</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Ca</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn…" @default.
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• W2070677268 doi "https://doi.org/10.1103/physrevb.53.5942" @default.
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