A New Study That Combines Various Fields of Physics in A Single Platform of Ideal Kagome Metals
The electronic behavior of those crystalline “kagome” structures varies with the ratio of iron to tin atoms, often three to two or three to one.
The previous year, the MIT group members and their colleagues reported that Fe3Sn2, a compound with a 3 to two ratio of iron to tin, generates Dirac fermions—a particular type of electronic state during which the spin of the electron and the orbit of the electron are coupled to each other. This special state of electron motion is protected by the topology, or geometric structure, of the crystal.
Iron-tin compounds are of specific interest as a result of the natural magnetism of iron atoms additional impacts their electronic behavior, specifically causing the spins of neighboring electrons to alternate in reverse directions (clockwise or counterclockwise), which known as antiferromagnetism. In a report published Dec. 9 in Nature Materials, these researchers and 18 co-authors in the US and elsewhere discover that in a one to one iron-tin compound, the symmetry of the kagome lattice is special, simultaneously hosting each infinitely light massless particle (known as Dirac fermions) and infinitely heavy particles (which manifest experimentally as flat bands within the electronic structure of the material).
the research combines numerous fields of physics (topology, magnetism, and strongly correlated electrons) in a single platform of best kagome metals
The researchers confirmed their findings on the electronic structure of 1 to one iron-tin by combining two complementary electronic structure probes: angle-resolved photoemission spectroscopy (ARPES) and de Haas-van Alphen quantum oscillation experiments.