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Significance The Cu extended X-ray absorption fine structure of YSr2 Cu2.75 Mo0.25 O7.54 (with superconducting critical temperature, Tc , = 84 K) and Sr2 CuO3.3 (Tc = 95 K) through their superconducting transitions demonstrates that the common factor in superconductivity in cuprates, including those prepared by high-pressure oxygenation, is an internal quantum tunneling polaron in its dynamical structure. In addition, Sr2 CuO3.3 is the first material to show a concomitant transformation in this structure involving atom displacements &gt;1 Å that would be expected to modify its Fermi surface, which would complicate the transition beyond a purely electronic one consisting of the pairing of electrons of opposite momentum across fixed electronic states.

proceedings of the national academy of sciences

Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr 2 Cu 2.75 Mo 0.25 O 7.54 and Sr 2 CuO 3.3