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 similar or equal to 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 A(1-x)Fe(2-y)Se(2) is closely related to the transition to a locally more ordered state, which has a different electronic structure.

Interplay of electronic and lattice degrees of freedom in A_{1−x}Fe_{2−y}Se_{2} superconductors under pressure / M., Bendele; C., Marini; B., Joseph; G. M., Pierantozzi; A. S., Caporale; A., Bianconi; E., Pomjakushina; K., Conder; A., Krzton Maziopa; T., Irifune; T., Shinmei; S., Pascarelli; Dore, Paolo; Saini, Naurang Lal; Postorino, Paolo. - In: PHYSICAL REVIEW. B, CONDENSED MATTER AND MATERIALS PHYSICS. - ISSN 1098-0121. - 88:18(2013). [10.1103/physrevb.88.180506]

Interplay of electronic and lattice degrees of freedom in A_{1−x}Fe_{2−y}Se_{2} superconductors under pressure

DORE, Paolo;SAINI, Naurang Lal;POSTORINO, Paolo
2013

Abstract

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 similar or equal to 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 A(1-x)Fe(2-y)Se(2) is closely related to the transition to a locally more ordered state, which has a different electronic structure.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/555532
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