Unconventional Hund metal in a weak itinerant ferromagnet

Xiang Chen, Igor Krivenko, Matthew B. Stone, Alexander I. Kolesnikov, Thomas Wolf, Dmitry Reznik, Kevin S. Bedell, Frank Lechermann () and Stephen D. Wilson ()
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Xiang Chen: University of California
Igor Krivenko: University of Michigan
Matthew B. Stone: Neutron Scattering Division, Oak Ridge National Laboratory
Alexander I. Kolesnikov: Neutron Scattering Division, Oak Ridge National Laboratory
Thomas Wolf: Institute for Solid State Physics, Karlsruhe Institute of Technology
Dmitry Reznik: University of Colorado at Boulder
Kevin S. Bedell: Boston College
Frank Lechermann: Universität Hamburg
Stephen D. Wilson: University of California

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract 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 its 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.

Date: 2020
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DOI: 10.1038/s41467-020-16868-4

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