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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,...
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