Magnetoresistance Anomaly in Topological Kondo Insulator SmB₆ Nanowires with Strong Surface Magnetism.

ABSTRACT: Topological Kondo insulators (TKIs) are a new class of topological materials in which topological surface states dominate the transport properties at low temperatures. They are also an ideal platform for studying the interplay between strong electron correlations and topological order. Here, hysteretic magnetoresistance (MR) is observed in TKI SmB₆ thin nanowires at temperatures up to 8 K, revealing the strong magnetism at the surface of SmB₆. It is also found that such MR anomaly exhibits an intriguing finite size effect and only appears in nanowires with diameter smaller than 58 nm. These nontrivial phenomena are discussed in terms of the latest Kondo breakdown model, which incorporates the RKKY magnetic interaction mediated by surface states with the strong electro

SUBMITTER: He X 

PROVIDER: S-EPMC6051400 | biostudies-literature | 2018 Jul

REPOSITORIES: biostudies-literature