2013/06/18 by M. Bendele, Carlo Marini, C. Marini +19 · 1 citation
Biochemistry, Genetics and Molecular Biology · Materials Science · Physics and Astronomy · #Amyloidosis: Diagnosis, Treatment, Outcomes #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.mtrl-sci #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.88.180506
published as Phys. Rev. B 88, 180506(R) (2013)
arxiv created 2013/06/18 · openalex publication_date 2013/11/12 · arxiv updated 2013/11/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
The local structure and electronic properties of Rb_1\ensuremath-xFe_2\ensuremath-ySe2 are investigated by means of site selective polarized x-ray absorption spectroscopy at the iron and selenium K edges as a function of pressure. A combination of dispersive geometry and a nanodiamond anvil pressure cell has permitted us to reveal a steplike decrease in the Fe-Se bond distance at p\ensuremath≃11 GPa and, at the same pressure, the local atomic structure of Rb_1\ensuremath-xFe_2\ensuremath-ySe2 becomes more ordered. Thus, at this pressure the phase separation might be suppressed, which has a large influence on the electronic structure, as evidenced by changes in the Fe K-edge prepeak. The present results provide compelling evidence that the reemerging superconductivity in A_1\ensuremath-xFe_2\ensuremath-ySe2 is closely related to the transition to a locally more ordered state, which has a different electronic structure.