Signature of surface state coupling in thin films of the topological Kondo insulator SmB$_6$ from anisotropic magnetoresistance

  title={Signature of surface state coupling in thin films of the topological Kondo insulator SmB\$\_6\$ from anisotropic magnetoresistance},
  author={M. Petrushevsky and P. K. Rout and Georges L{\'e}vi and Amit Kohn and Y. Dagan},
  journal={arXiv: Strongly Correlated Electrons},
The temperature and thickness dependencies of the in-plane anisotropic magnetoresistance (AMR) of SmB$_6$ thin films are reported. We find that the AMR changes sign from negative ($\rho_{||} \rho_{\perp}$) at low temperatures. The temperature, T$_s$, at which this sign change occurs, decreases with increasing film thickness $t$ and T$_s$ vanishes for $t$ $>$ 30 nm. We interpret our results in the framework of a competition between two components: a negative bulk contribution and a positive… 

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