Two-dimensional resonant magnetic excitation in BaFe1.84Co0.16As2
M. D. Lumsden, A. D. Christianson, D. Parshall, M. B. Stone, S. E., Nagler, G.J. MacDougall, H. A. Mook, K. Lokshin, T. Egami, D. L. Abernathy,, E. A. Goremychkin, R. Osborn, M. A. McGuire, A. S. Sefat, R. Jin, B. C., Sales, and D. Mandrus
TL;DR
This study uses inelastic neutron scattering to reveal a two-dimensional magnetic resonance in superconducting BaFe1.84Co0.16As2, showing a resonance peak below Tc with strong in-plane dispersion and weak out-of-plane dispersion.
Contribution
It provides the first detailed characterization of the two-dimensional magnetic excitation spectrum in this iron-based superconductor.
Findings
Resonance peak at 8.6 meV below Tc
Strong in-plane dispersion of magnetic excitations
Weak out-of-plane dispersion indicating two-dimensionality
Abstract
Inelastic neutron scattering measurements on single crystals of superconducting BaFe1.84Co0.16As2 reveal a magnetic excitation located at wavevectors (1/2 1/2 L) in tetragonal notation. On cooling below TC, a clear resonance peak is observed at this wavevector with an energy of 8.6(0.5) meV, corresponding to 4.5(0.3) kBTC. This is in good agreement with the canonical value of 5 kBTC observed in the cuprates. The spectrum shows strong dispersion in the tetragonal plane but very weak dispersion along the c-axis, indicating that the magnetic fluctuations are two-dimensional in nature. This is in sharp contrast to the anisotropic three dimensional spin excitations seen in the undoped parent compounds.
Peer Reviews
No public reviews on file for this paper yet. If you reviewed it on a platform where reviews are public (OpenReview, ICLR, NeurIPS, ICML), you can paste yours below so the community can read it here.
Videos
No videos yet. Explain this paper in a talk, walkthrough, or lecture? Add one.