Effect of reduced sample dimensions on the insulating state of SmB6

ORAL

Abstract

The putative topological Kondo insulator SmB6 has shown compelling evidence of robust conductive surface states, however less attention has been paid to the insulating bulk states which lies beneath. Here, we present the electrical transport measurements of the insulating state of SmB6 down to T ~ 250 mK. We observed that the temperature dependence of resistivity shows additional power law-like dependence with temperature. These features develop below T < 1.5 K with reduction of sample dimensions, typically below 150 μm. We discuss whether the origin of these features are from dominant surface conduction over bulk conduction or due to impurities.

–

Presenters

  • Joonbum Park

    Los Alamos National Laboratory

Authors

  • Joonbum Park

    Los Alamos National Laboratory

  • Mun Chan

    Los Alamos National Laboratory, Los Alamos National Labs

  • Priscila Rosa

    Los Alamos National Laboratory, MPA-CMMS, Los Alamos National Laboratory, Los Alamos, USA, Condensed Matter and Magnet Sciences, Los Alamos National Laboratory

  • Neil Harrison

    Pulsed Field Facility, NHMFL, MPA-MAG, Los Alamos National Laboratory, Los Alamos National Laboratory, MPA-MAG, Los Alamos National Laboratory, Los Alamos, USA