Abstract
Recently, Hg-based superconductors HgBa2Can−1CunO2n+2+x (n=l,2,3) were demonstrated to have remarkably high transition temperatures (Tc). The Hg-compounds are structurally analogous to the previously discovered Tlbased compounds TlBa2Can−1CunO2n+2+x. Oxygen site occupation in the rock-salt Hg-O layers and Tl-O layers differ, due to the difference in the valence states of Tl (III) and Hg (II). In the Hg-compounds the Hg-O layer is always single while in the Tl-compounds both single or double Tl-O layers are possible. Up to 4 Cu-O2 layers may be found in both families. Martin et al. investigated the mixed Hg-Tl system and reported a new structure akin to a single cell Hg-1201/Tl-2201 intergrowth, having a Tc about half that of either individual compound. We synthesized mixed Hg-Tl compounds corresponding to the higher order intergrowth formula Tl2Hg1 Ba4Ca4Cu6Ox (Hg-1223/Tl-2223) with the hope of producing new intergrowth structures with higher Tc. In this report, we only describe our structural characterization on one of the Tl-Hg compounds with nominal composition Tl2Hg1 Ba4Ca4Cu6Ox. A complete report on the synthesis and properties of these compounds will be published elsewhere.
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