Crystal structure of the new FeSe1-x superconductor
S. Margadonna, Y. Takabayashi, M. T. McDonald, K. Kasperkiewicz, Y., Mizuguchi, Y. Takano, A. N. Fitch, E. Suard, and K. Prassides
TL;DR
This paper reports the crystal structure of a new FeSe1-x superconductor, revealing its phase transition and structural similarities to other iron-based superconductors, which could inform understanding of its superconducting properties.
Contribution
It provides the first detailed crystal structure analysis of FeSe1-x, highlighting its phase transition and structural similarities to REFeAsO1-xFx superconductors.
Findings
FeSe1-x exhibits a tetragonal to orthorhombic transition below 70 K.
Superconducting structure closely resembles REFeAsO1-xFx superconductors.
Superconducting transition temperature increases under pressure.
Abstract
The newly discovered superconductor FeSe1-x (x=0.08, Tconset=13.5 K at ambient pressure rising to 27 K at 1.48 GPa) exhibits a structural phase transition from tetragonal to orthorhombic below 70 K at ambient pressure - the crystal structure in the superconducting state shows remarkable similarities to that of the REFeAsO1-xFx (RE = rare earth) superconductors
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