Sizable oxygen isotope effects in the electron-dopedPr1.85Ce0.15CuO4−y

Abstract
Oxygen isotope effects have been investigated in the electron-doped Pr1.85 Ce0.15 CuO4y. We find the exponent of oxygen isotope effect αO=0.08±0.01. The sizable oxygen isotope effect in this electron-doped system indicates that the electron-phonon interaction plays an important role in the pairing mechanism.