High-temperature surface state in Kondo insulator U₃Bi₄Ni₃.

ABSTRACT: The resurgence of interest in Kondo insulators has been driven by two major mysteries: the presence of metallic surface states and the observation of quantum oscillations. To further explore these mysteries, it is crucial to investigate another similar system beyond the two existing ones, SmB₆ and YbB₁₂. Here, we address this by reporting on a Kondo insulator, U₃Bi₄Ni₃. Our transport measurements reveal that a surface state emerges below 250 kelvin and dominates transport properties below 150 kelvin, which is well above the temperature scale of SmB₆ and YbB₁₂. At low temperatures, the surface conductivity is about one order of magnitude higher than the bulk. The robustness of the surface state indicates that it is

SUBMITTER: Broyles C 

PROVIDER: S-EPMC11927635 | biostudies-literature | 2025 Mar

REPOSITORIES: biostudies-literature