Unconventional Hund metal in a weak itinerant ferromagnet

Chen, Xiang; Krivenko, Igor; Stone, Matthew B.; Kolesnikov, Alexander I.; Wolf, Thomas; Reznik, Dmitry; Bedell, Kevin S.; Lechermann, Frank; Wilson, Stephen D.

doi:10.1038/s41467-020-16868-4

Title: Unconventional Hund metal in a weak itinerant ferromagnet

Journal Article · 17 June 2020 · Nature Communications

DOI: https://doi.org/10.1038/s41467-020-16868-4 · OSTI ID:1633673

Chen, Xiang ^[1];

^[2];

^[3];

^[3]; Wolf, Thomas ^[4];

^[5]; Bedell, Kevin S. ^[6]; Lechermann, Frank ^[7];

^[1]

Univ. of California, Santa Barbara, CA (United States)
Univ. of Michigan, Ann Arbor, MI (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Karlsruhe Inst. of Technology (Germany). Inst. for Solid State Physics
Univ. of Colorado, Boulder, CO (United States)
Boston College, Chestnut Hill, MA (United States)
Univ. Hamburg (Germany). Inst. for Theoretical Physics

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. Furthermore, 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.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); German Research Foundation (DFG); National Science Foundation (NSF); USDOE

Grant/Contract Number:: AC05-00OR22725; DMR 1720256; LE-2446/4-1; SC0006939

OSTI ID:: 1633673

Alternate ID(s):: OSTI ID: 1666011

Journal Information:: Nature Communications, Vol. 11, Issue 1; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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