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- W2050693651 abstract "Based on the powder x-ray and TEM analyses, the bulk 2aifmmodetimeselsetexttimesfi{}2bifmmodetimeselsetexttimesfi{}c superstructure of tetracyanoquinodimethane (TCNQ) treated (Bi,Pb)-2:2:2:3 cuprates has been attributed to an ordering of oxygen vacancies in the covalent ${mathrm{CuO}}_{2}$ layers and is also likely in the ionic SrO layers. Both electrical resistivity and thermopower for the (Bi,Pb)-2:2:2:3 cuprate undergo dramatic changes after TCNQ treatment. Electrical conductivity of TCNQ-treated (Bi,Pb)-2:2:2:3 cuprates with bulk 2aifmmodetimeselsetexttimesfi{}2bifmmodetimeselsetexttimesfi{}c superstructure shows a metal-like temperature dependence with high resistivity (${10}^{2}$--${10}^{3}$ ensuremath{Omega} cm), and a relatively rapid resistivity drop at ensuremath{sim}11.7 K. High resistivity of this material indicates a significantly reduced hole carrier concentration in the ${mathrm{CuO}}_{2}$ layers. The thermopower is positive and exhibits a metallic-diffusion behavior, resembling the thermopower ${mathit{S}}_{mathit{c}}$ in the c direction for Bi-2:2:1:2 single crystals. The disappearance of peak thermopower in this material suggests that the commonly observed peak behavior in cuprate superconductors is associated with the hole carriers in the ${mathrm{CuO}}_{2}$ layers. In the framework of Kaiser's metallic-diffusion thermopower model, it seems that the abnormally large electron-phonon enhancement effect on the thermopower arising from the ${mathrm{CuO}}_{2}$ layers in the pristine (Bi,Pb)-2:2:2:3 cuprate is significantly reduced in the TCNQ-treated samples with the 2aifmmodetimeselsetexttimesfi{}2bifmmodetimeselsetexttimesfi{}c superstructure. This could be due to a reduced in-plane conductivity contribution as a result of one-fourth of the oxygen missing in the ${mathrm{CuO}}_{2}$ layers." @default.
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- W2050693651 date "1995-10-01" @default.
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- W2050693651 title "Thermoelectric power of bulk (Bi,Pb)2-2:2:2:3 cuprates with the 2a×2b×csuperstructure" @default.
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- W2050693651 doi "https://doi.org/10.1103/physrevb.52.10499" @default.
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