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18 April 2024

» arxiv » 1612.0399

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Signature of surface state coupling in thin films of the topological Kondo insulator SmB$_6$ from anisotropic magnetoresistance
M. Shaviv Petrushevsky ; P. K. Rout ; G. Levi ; A. Kohn ; Y. Dagan ;
Date:	1 Dec 2016
Abstract:	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 ($ ho_{\|\|}< ho_{perp}$) at high temperatures to positive ($ ho_{\|\|}> ho_{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 surface AMR.
Source:	arXiv, 1612.0399
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