6 research outputs found
Unconventional Hund Metal in a Weak Itinerant Ferromagnet
The physics of weak itinerant ferromagnets is challenging due to their small
magnetic moments and the ambiguous role of local interactions governing their
electronic properties, many of which violate Fermi liquid theory. While
magnetic fluctuations play an important role in the materials' unusual
electronic states, the nature of these fluctuations and the paradigms through
which they arise remain debated. Here we use inelastic neutron scattering to
study magnetic fluctuations in the canonical weak itinerant ferromagnet MnSi.
Data reveal that short-wavelength magnons continue to propagate until a mode
crossing predicted for strongly interacting quasiparticles is reached, and the
local susceptibility peaks at a coherence energy predicted for a correlated
Hund metal by first-principles many-body theory. Scattering between electrons
and orbital and spin fluctuations in MnSi can be understood at the local level
to generate non-Fermi liquid character. These results provide crucial insight
into the role of interorbital Hund's exchange within the broader class of
enigmatic multiband itinerant, weak ferromagnets.Comment: 17 pages, 4 figure