Abstract
It is proposed that a large T c enhancement of the Ba(Pb 1−xBi x)O 3 superconductor with x ≈ 0.25 is due to the pre-existing charge density wave formed at a higher temperature, whose gap edge singularity helps to increase the density of states at the Fermi level. A scenario of the successive phase transitions as x varies gives some clue as to why “high- T c ” is often associated with the marginal instability of the metal-non-metal transition. Recent finding of T c ∼ 20 K in (Ba 0.9K 1BiO 3 (x ∼ 0.2) is interpreted in this context.
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