Local-structure insight into the improved superconducting properties of Pb-substituted La(O, F)BiS2: a photoelectron holography study

Abstract

Abstract Pb-substituted La(O, F)BiS 2 (Pb-LaOFBiS 2 ) exhibits improved superconducting properties and a resistivity anomaly around 100 K that is attributed to a structural transition. We have performed temperature( T )-dependent photoelectron holography (PEH) to study dopant incorporation sites and the local structure change across the anomaly. The PEH study of Pb-LaOFBiS 2 provided evidence for the dominant incorporation sites of Pb and F: Pb atoms are incorporated into the Bi sites and F atoms are incorporated into the O site. No remarkable difference in the local structures around Pb and Bi atoms was observed. Across the temperature of the resistivity anomaly ( T * ), photoelectron holograms of Bi 4f changed. Comparisons of holograms with those of non-substituted LaOFBiS 2 sample, as well as simulated holograms, suggested that (1), above T * , the tetragonal structure of Pb-LaOFBiS 2 is different from the tetragonal structure of LaOFBiS 2 and (2), below T * , the tetragonal structure still remains in Pb-LaOFBiS 2 . We discuss a possible origin of the difference in the structure above T * and the implication of the result below T * , which are necessary ingredients to understand the physical properties of Pb-LaOFBiS 2 .