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


The 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.
Author M. Bendele - [Universita degli Studi di Roma La Sapienza]
M. Bendele,,
, C. Marini - [European Synchrotron Radiation Facility]
C. Marini,,
, B. Joseph - [Universita degli Studi di Roma La Sapienza]
B. Joseph,,
, G. M. Pierantozzi - [Universita degli Studi di Roma La Sapienza]
G. M. Pierantozzi,,
, A. S. Caporale - [Universita degli Studi di Roma La Sapienza]
A. S. Caporale,,
, A. Bianconi - [Rome International Center for Materials Science Superstripes]
A. Bianconi,,
, E. Pomjakushina - [Paul Scherrer Institut]
E. Pomjakushina,,
, K. Conder - [Paul Scherrer Institut]
K. Conder,,
, Anna Krztoń-Maziopa (FC / CICSST)
Anna Krztoń-Maziopa,,
- Chair Of Inorganic Chemistry And Solid State Technology
, T. Irifune - [Ehime University]
T. Irifune,,
et al.`
Journal seriesPhysical Review B, ISSN 1098-0121
Issue year2013
Publication size in sheets0.5
ASJC Classification3104 Condensed Matter Physics; 2504 Electronic, Optical and Magnetic Materials
Languageen angielski
PhysRevB.88.180506.pdf 544.08 KB
Score (nominal)35
Score sourcejournalList
ScoreMinisterial score = 35.0, 31-01-2020, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 31-01-2020, ArticleFromJournal
Publication indicators Scopus Citations = 13; WoS Citations = 14; Scopus SNIP (Source Normalised Impact per Paper): 2013 = 1.326; WoS Impact Factor: 2013 = 3.664 (2) - 2013=3.564 (5)
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