The local structure and the electronic properties of FeSe under hydrostatic pressure were studied by means of dispersive x-ray absorption measurements at the Fe K-edge. The pressure dependence of the x-ray absorption near edge structure features seems to follow the behavior of the superconducting transition temperature T-c. The local structure, that has an important impact on the superconducting properties, appears to fall into two regimes: the pressure dependence of the Fe-Fe bond distance shows a clear change in the compressibility at p similar to 5 GPa; in contrast, the Fe-Se bond distance decreases continuously with increasing pressure with a lower compressibility than the Fe-Fe bond. The results suggest that the pressure dependent changes in T-c of FeSe are closely related to the changes in local structure.

Dispersive x-ray absorption studies at the Fe K-edge on the iron chalcogenide superconductor FeSe under pressure / M., Bendele; C., Marini; B., Joseph; L., Simonelli; Dore, Paolo; S., Pascarelli; M., Chikovani; E., Pomjakushina; K., Conder; Saini, Naurang Lal; Postorino, Paolo. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 25:42(2013), p. 425704. [10.1088/0953-8984/25/42/425704]

Dispersive x-ray absorption studies at the Fe K-edge on the iron chalcogenide superconductor FeSe under pressure

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

Abstract

The local structure and the electronic properties of FeSe under hydrostatic pressure were studied by means of dispersive x-ray absorption measurements at the Fe K-edge. The pressure dependence of the x-ray absorption near edge structure features seems to follow the behavior of the superconducting transition temperature T-c. The local structure, that has an important impact on the superconducting properties, appears to fall into two regimes: the pressure dependence of the Fe-Fe bond distance shows a clear change in the compressibility at p similar to 5 GPa; in contrast, the Fe-Se bond distance decreases continuously with increasing pressure with a lower compressibility than the Fe-Fe bond. The results suggest that the pressure dependent changes in T-c of FeSe are closely related to the changes in local structure.
2013
01 Pubblicazione su rivista::01a Articolo in rivista
Dispersive x-ray absorption studies at the Fe K-edge on the iron chalcogenide superconductor FeSe under pressure / M., Bendele; C., Marini; B., Joseph; L., Simonelli; Dore, Paolo; S., Pascarelli; M., Chikovani; E., Pomjakushina; K., Conder; Saini, Naurang Lal; Postorino, Paolo. - In: JOURNAL OF PHYSICS. CONDENSED MATTER. - ISSN 0953-8984. - 25:42(2013), p. 425704. [10.1088/0953-8984/25/42/425704]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/555531
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