Spin fluctuations away from (π,0) in the superconducting phase of molecular-intercalated FeSe

A. E. Taylor; S. J. Sedlmaier; S. J. Cassidy; E. A. Goremychkin; R. A. Ewings; T. G. Perring; S. J. Clarke; A. T. Boothroyd

doi:10.1103/PhysRevB.87.220508

Spin fluctuations away from (π,0) in the superconducting phase of molecular-intercalated FeSe

A. E. Taylor, S. J. Sedlmaier, S. J. Cassidy, E. A. Goremychkin, R. A. Ewings, T. G. Perring, S. J. Clarke, A. T. Boothroyd

DOI 10.1103/PhysRevB.87.220508 · Physical Review B

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Abstract

Magnetic fluctuations in the molecular-intercalated FeSe superconductor Lix(ND2)y(ND3)1−yFe2Se2 (Tc=43K) have been measured by inelastic neutron scattering from a powder sample. The strongest magnetic scattering is observed at a wave vector Q≈1.4 Å−1, which is not consistent with the (π,0) nesting wave vector that characterizes magnetic fluctuations in several other iron-based superconductors but is close to the (π,π/2) position found for AxFe2−ySe2 systems. At the energies probed (∼5kBTc), the magnetic scattering increases in intensity with decreasing temperature below Tc, consistent with the superconductivity-induced magnetic resonance found in other iron-based superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Lix(ND2)y(ND3)1-yFe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
Li0.6(ND2)0.2(ND3)0.8Fe2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	43	Pressure not reported	unknown
FeSe1-xTex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14.5	Pressure unresolved	unknown
FeSe1-xTex Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	37	0.89 GPa	unknown
Lix(C5H5N)yFe2-zSe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown