Abstract
Accurate measurements of T c ( δ) and ΔC p(δ) T c(δ) in the titled compound have shown sharp breaks in slope at or very near δ = δ 0 = 0.125. This behavior is explained by a supercell model which is similar to one previously proposed to explain the formation of the low-temperature tetragonal phase centered on x = x 0 = 0.125 in La 2− x (Ba,Sr) x CuO 4 alloys. Supercell ordering of resonant pinning centers is essential to produce coherent electron-phonon interactions mediated by such centers. Thus these data provide evidence for the crucial element in the quantum percolation model of high-temperature superconductivity.
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