Oxygen isotope effect in cuprates results from polaron-induced superconductivity

Abstract

The planar oxygen isotope effect coefficient measured as a function of hole doping in
the Pr- and La-doped YBa2Cu3O7 (YBCO) and the Ni-doped La1.85Sr0.15CuO4 (LSCO)
superconductors quantitatively and qualitatively follows the form originally proposed by
Kresin and Wolf [Phys. Rev. B 49, 3652 (1994)], which was derived for polarons
perpendicular to the superconducting planes. Interestingly, the inverse oxygen isotope effect
coefficient at the pseudogap temperature also obeys the same formula. These findings allow
the conclusion that the superconductivity in YBCO and LSCO results from polarons or rather
bipolarons in the CuO2 plane. The original formula, proposed for the perpendicular direction
only, is obviously more generally valid and accounts for the superconductivity in the CuO2
planes.