Abstract
In superconducting MmA2Qn−lCunOm+2+2n±δ phases the charge of the Qn−lCunO2n infinite-layer block depends in general on the charge of the MmOm±δ charge-reservoir block, which at a certain metal constituent Mm can be tuned by changing the oxygen stoichiometry δ. In the Tl- and Hg- based cuprates, however, determination of the exact oxygen content does not alone define the charge of the MmOm±δ unit, since both Tl and Hg may exhibit mixed-valent states. For a quantitative estimation of the charge balances, both wet chemical redox analyses and bond-valence calculations are utilized. Furthermore, based on the results of the bond-valence calculations, three different routes of hole-doping the CuO2 planes are distinguished, and the actual conductance of these routes is discussed in several different Tl/Hg-m2(n-l)n phases.
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Karppinen, M., Yamauchi, H. Metal Valences and Hole-Doping Routes in Tl- and Hg-based Superconducting Cuprates. Journal of Superconductivity 11, 39–42 (1998). https://doi.org/10.1023/A:1022617525968
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DOI: https://doi.org/10.1023/A:1022617525968