Fig. 1: Dispersion of spin fluctuations in MnSi away from the low-q limit.
From: Unconventional Hund metal in a weak itinerant ferromagnet
a Illustration depicting low-q spin waves (green lines) entering the Stoner continuum (shaded light blue) and continuing dispersing toward the zone boundary. A second decay channel is accessed at the crossing with the Δ-mode (dashed red line) and a continuum of spin fluctuations onsets (vertical shaded green bar). b High-energy continuum of spin excitations in MnSi collected at Ei = 150 meV and T =5 K. c Low-energy dispersion of damped magnons within the Stoner continuum, collected with Ei = 30 meV at T = 5 K. d, e The dispersion of spin excitations via constant energy slices of S(q,Ε) at 75 and 7.5 meV, respectively (H is centered about H = −2). Black dashed lines in b denote the zone boundaries at ξ = 0.5 r.l.u. Black dashed circles in d and e signal the ring-like spin wave excitation, where the radii are in line with the fitted values from b and c and Fig. 2. The color bar denotes scattering intensity in arbitrary units with high scattering intensity in red and low scattering intensity in blue.
