Triiron ditin intermetallic

The compound with empirical formula Fe3Sn2 is the first known kagome magnet. It is an intermetallic compound composed of iron (Fe) and tin (Sn), with alternating planes of Fe3Sn and Sn.[1]

Triiron ditin intermetallic
Identifiers
3D model (JSmol)
  • InChI=1S/3Fe.2Sn
    Key: CQCUKVSIWYDQMI-UHFFFAOYSA-N
  • [Fe].[Fe].[Fe].[Sn].[Sn]
Properties
Fe3Sn·Sn
Structure[1]
Kagome
R3m
a = 5.338 Å, c = 19.789 Å
hexagonal
Related compounds
Related compounds
 Fe3Sn
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Infobox references

Preparation

The iron-tin intermetallic forms at around 750 °C (1,380 °F) and naturally assumes a kagome structure.[2] Quenching in an ice bath then cools the material to room temperature without disrupting the atomic structure.[3]

Electronic structure

The compound's band structure exhibits a double Dirac cone, enabling Dirac fermions. A 30 meV gap separates the cones, which indicates the quantum Hall effect and massive Dirac fermions.[4] Close measurement of the Fermi surface via the de Haas-van Alphen effect suggests that the massive fermions also exhibit Kane-Mele-type spin-orbit coupling.[5]

Fe3Sn2 can also host magnetic skyrmions, but these typically require high magnetic fields to nucleate. For samples with a small (but nonzero) thickness gradient, only a small-amplitude (5-10 mT), direction-variant magnetic field suffices to nucleate the quasiparticles.[6]

References
  1. Ye, Linda; Kang Mingu; Liu Junwei; von Cube, Felix; Wicker, Christina R.; Suzuki Takehito; Jozwiak, Chris; Bostwick, Aaron; Rotenberg, Eli; Bell, David C.; Fu Liang (19 March 2018). "Massive Dirac fermions in a ferromagnetic kagome metal". Nature. 555 (7698): 638–642. arXiv:1709.10007. Bibcode:2018Natur.555..638Y. doi:10.1038/nature25987. ISSN 1476-4687. PMID 29555992. S2CID 4470420.
  2. Aristos Georgiou (March 20, 2018). "Kagome metal: new exotic quantum material developed by scientists". Newsweek.
  3. Chu, Jennifer (March 19, 2018). "Physicists discover new quantum electronic material". MIT News. Massachusetts Institute of Technology.
  4. "The Electronic Structure of a 'Kagome' Material". ALS. Lawrence Berkeley National Lab. 2018-06-15. Retrieved 2020-04-17.
  5. Ye, Linda; Chan Mun K.; McDonald, Ross D.; Graf, David; Kang Mingu; Liu Junwei; Suzuki Takehito; Comin, Riccardo; Fu Liang; Checkelsky, Joseph G. (2019-10-25). "De Haas-van Alphen effect of correlated Dirac states in kagome metal Fe3Sn2". Nature Communications. 10 (1): 4870. arXiv:1809.11159. Bibcode:2019NatCo..10.4870Y. doi:10.1038/s41467-019-12822-1. ISSN 2041-1723. PMC 6814717. PMID 31653866.
  6. Wang Binbin; Wu Po-kuan; Bagués Salguero, Núria; Zheng Qiang; Yan Jiaqiang; Randeria, Mohit; McComb, David W. (2021-08-24). "Stimulated Nucleation of Skyrmions in a Centrosymmetric Magnet". ACS Nano. 15 (8): 13495–13503. doi:10.1021/acsnano.1c04053. ISSN 1936-0851. OSTI 1819517. PMID 34374281. S2CID 236967261.
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