Abstract
Attention is redrawn to published work on a negativeU perception of how HTSC develops in the mixed-valent cuprates and bismuthates. The mechanism that has been proposed is one of a two-subsystem, three-center, dynamic seeded disproportionation, driven by strong shell-closure effects in high-valent environment. In pursuing why alternative proposals seem less viable we have made an examination of the oxyhalide systems TiOCl(Br) substituted with scandium. Thesed 1 oxyhalides are prime candidates for RVB behavior, though not, it seems, superconductivity.
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