Phys.org October 30, 2024
The rare earth RMn6Sn6 (R = rare earth) family magnetic kagome systems, where their kagome flat bands are calculated to be near the Fermi level in the paramagnetic phase have been reported. While partially filling a kagome flat band is predicted to give rise to a Stoner-type ferromagnetism, experimental visualization of the magnetic splitting across the ordering temperature has not been reported for any of these systems leaving the nature of magnetism in kagome magnets an open question. An international team of researchers (USA – Rice University, Brookhaven National Lab, Los Alamos National Laboratory, Israel, Czech Republic) probed the electronic structure in a kagome magnet thin film FeSn synthesized using molecular beam epitaxy. They identified the exchange-split kagome flat bands, whose splitting persisted above the magnetic ordering temperature, indicative of a local moment picture. They observed a large spin-orbital selective band renormalization in the Fe spin majority channel reminiscent of the orbital selective correlation effects in the iron-based superconductors. According to the researchers their discovery provides a basis for theoretical effort towards modeling correlation effects in magnetic flat band systems… read more. Open Access TECHNICAL ARTICLE
Basic characterizations of the FeSn film. Credit: Nature Communications volume 15, Article number: 9376, 30 October 2024