Location of oxygen vacancies in Sr2CuO3+δ single crystal determined by polarized EXAFS at Cu K-edge

Abstract The location of oxygen vacancies in Sr 2 CuO 3+δ single crystal has been studied by polarized extended x-ray absorption fine structure (PEXAFS) at Cu K -edge. We found that the oxygen vacancies locate both in the CuO 2 plane and at the apical site. Among the total 18 ± 8% oxygen vacancies, about 10 ± 5% locates in the CuO 2 plane and 8 ± 3% at the apical site.