Oxygen isotope effect inBi2Sr2Can−1CunO2n+4+δ(n=1,2,3)single crystals

摘要: We report measurements of the oxygen isotope effect in ${\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}{\mathrm{Ca}}_{n\ensuremath{-}1}{\mathrm{Cu}}_{n}{\mathrm{O}}_{2n+4+\ensuremath{\delta}}$ $(n=1,2,3)$ single crystals. For optimally doped materials exponent is found to decrease with increasing number $\mathrm{Cu}{\mathrm{O}}_{2}$ layers a manner inversely correlating superconducting transition temperature this homologous family. This behavior contrast general belief that can be negligible for cuprates. Our results highlight important role played by phonons and interlayer coupling high-temperature superconductivity.