An international team has shown that the puzzling properties of samarium hexaboride do not stem from the material being a topological insulator, as it had been proposed to be. Theoretical and initial experimental work had previously indicated that this material, which becomes a Kondo insulator at very low temperatures, also possessed the properties of a topological insulator. The team has now published a compelling alternative explanation.
from Engineering and Construction News – ScienceDaily https://www.sciencedaily.com/releases/2018/02/180206105847.htm
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