Nonadiabatic coupling of the dynamical structure to the superconductivity in YSr₂Cu_2.75Mo_0.25O_7.54 and Sr₂CuO_3.3.

ABSTRACT: A crucial issue in cuprates is the extent and mechanism of the coupling of the lattice to the electrons and the superconductivity. Here we report Cu K edge extended X-ray absorption fine structure measurements elucidating the internal quantum tunneling polaron (iqtp) component of the dynamical structure in two heavily overdoped superconducting cuprate compounds, tetragonal YSr₂Cu_2.75Mo_0.25O_7.54 with superconducting critical temperature, T_c = 84 K and hole density p = 0.3 to 0.5 per planar Cu, and the tetragonal phase of Sr₂CuO_3.3 with T_c = 95 K and p = 0.6. In YSr₂Cu_2.75Mo_0.25O_7.54 changes in the Cu-apical O two-site distribution reflect a sequen

SUBMITTER: Conradson SD 

PROVIDER: S-EPMC7776783 | biostudies-literature | 2020 Dec

REPOSITORIES: biostudies-literature