Interplay of electronic and lattice degrees of freedom in A1−xFe2−ySe2 superconductors under pressure
M. Bendele , C. Marini , B. Joseph , G. M. Pierantozzi , A. S. Caporale , A. Bianconi , E. Pomjakushina , K. Conder , Anna Krztoń-Maziopa , T. Irifune , T. Shinmei , S. Pascarelli , P. Dore , N. L. Saini , P. Postorino
AbstractThe local structure and electronic properties of Rb1−xFe2−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≃11 GPa and, at the same pressure, the local atomic structure of Rb1−xFe2−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 A1−xFe2−ySe2 is closely related to the transition to a locally more ordered state, which has a different electronic structure.
|Journal series||Physical Review B, ISSN 1098-0121|
|Publication size in sheets||0.5|
|Score|| = 35.0, 31-01-2020, ArticleFromJournal|
= 35.0, 31-01-2020, ArticleFromJournal
|Publication indicators||= 13; = 14; : 2013 = 1.326; : 2013 = 3.664 (2) - 2013=3.564 (5)|
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