Competing itinerant and local spin interactions in kagome metal FeGe

Chen, Lebing; Teng, Xiaokun; Tan, Hengxin; Winn, Barry L.; Granroth, Garrett E.; Ye, Feng; Yu, D. H.; Mole, R. A.; Gao, Bin; Yan, Binghai; Yi, Ming; Dai, Pengcheng

doi:10.1038/s41467-023-44190-2

Competing itinerant and local spin interactions in kagome metal FeGe

Journal Article · Fri Mar 01 00:00:00 EST 2024 · Nature Communications

DOI:https://doi.org/10.1038/s41467-023-44190-2· OSTI ID:2320374

Chen, Lebing ^[1]; ^[1]; ^[2]; Winn, Barry L. ^[3]; ^[3]; ^[3]; ^[4]; ^[4]; ^[1]; ^[2]; Yi, Ming ^[1]; ^[1]

Rice Univ., Houston, TX (United States)
Weizmann Institute of Science, Rehovot (Israel)
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Australian Nuclear Science and Technology Organisation (ANSTO), Lucas Heights, NSW (Australia)

The combination of a geometrically frustrated lattice, and similar energy scales between degrees of freedom endows two-dimensional Kagome metals with a rich array of quantum phases and renders them ideal for studying strong electron correlations and band topology. The Kagome metal, FeGe is a noted example of this, exhibiting A-type collinear antiferromagnetic (AFM) order at T_N ≈ 400 K, then establishes a charge density wave (CDW) phase coupled with AFM ordered moment below T_CDW ≈ 110 K, and finally forms a c-axis double cone AFM structure around T_Canting ≈ 60 K. Here we use neutron scattering to demonstrate the presence of gapless incommensurate spin excitations associated with the double cone AFM structure of FeGe at temperatures well above T_Canting and T_CDW that merge into gapped commensurate spin waves from the A-type AFM order. Commensurate spin waves follow the Bose factor and fit the Heisenberg Hamiltonian, while the incommensurate spin excitations, emerging below T_N where AFM order is commensurate, start to deviate from the Bose factor around T_CDW, and peaks at T_Canting. This is consistent with a critical scattering of a second order magnetic phase transition with decreasing temperature. By comparing these results with density functional theory calculations, we conclude that the incommensurate magnetic structure arises from the nested Fermi surfaces of itinerant electrons and the formation of a spin density wave order.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rice Univ., Houston, TX (United States)

Sponsoring Organization:: European Research Council (ERC); National Science Foundation (NSF); Robert A. Welch Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)

Grant/Contract Number:: AC05-00OR22725; SC0021421

OSTI ID:: 2320374

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 15; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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