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- W55866015 abstract "Our neutron-diffraction study of the single Tl-O layered ${mathrm{TlBa}}_{1mathrm{ensuremath{-}}mathit{x}}$${mathrm{Sr}}_{mathit{x}}$${mathrm{LaCuO}}_{5+mathrm{ensuremath{delta}}}$ system (x=0.0, 0.4, 0.7, and 1.0) shows that the in-plane Cu-O(2) bond length decreases monotonically with increase of x. This is consistent with the introduction of holes in ${mathrm{CuO}}_{2}$ layers or the appearance of superconductivity in the sample with x=0.4 (${mathit{T}}_{mathit{c}}$=22 K) and increase of ${mathit{T}}_{mathit{c}}$ with x, ${mathit{T}}_{mathit{c}}$=25 and 30 K for samples with x=0.7 and 1.0, respectively. Further, the valence of copper, derived from Cu-O bond length, increases with increase of x despite the fact that the O content decreases as x increases. This clearly suggests that the internal redox mechanism due to the overlap of the empty Tl 6s band with the filled Cu 3${mathit{d}}_{mathit{x}}^{2}$-${mathit{y}}^{2}$ band is responsible for the generation of holes, and therefore superconductivity, in these materials." @default.
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- W55866015 date "1995-08-01" @default.
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- W55866015 title "Redox mechanism for the generation of holes in<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>TlBa</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant=normal>−</mml:mi><mml:mi mathvariant=italic>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></…" @default.
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- W55866015 doi "https://doi.org/10.1103/physrevb.52.4427" @default.
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