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Transport gap in SmB6 protected against disorder.

Yun Suk Eo1, Alexa Rakoski2, Juniar Lucien2

  • 1Department of Physics, University of Michigan, Ann Arbor, MI 48109-1040; eohyung@umich.edu zfisk@uci.edu.

Proceedings of the National Academy of Sciences of the United States of America
|June 12, 2019
PubMed
Summary
This summary is machine-generated.

This study reveals samarium hexaboride (SmB6) as an ideal insulator, showing intrinsic thermal activation in bulk resistivity despite disorder. Its surface conduction is significant, yet the bulk material remains robust against defects.

Keywords:
heavy-fermion materialssemiconductorstopological insulator

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Solid-State Chemistry

Background:

  • Samarium hexaboride (SmB6) exhibits complex electronic properties, including a topological insulating state.
  • Understanding the interplay between bulk and surface conduction is crucial for SmB6 applications.
  • Disorder, induced by off-stoichiometric growth, can significantly alter material properties.

Purpose of the Study:

  • To investigate the bulk resistivity of SmB6 under conditions where surface conduction becomes dominant.
  • To determine if SmB6 maintains its insulating properties despite significant structural disorder.
  • To characterize the intrinsic electrical behavior of SmB6 bulk.

Main Methods:

  • The inverted resistance method was employed to measure bulk resistivity.
  • Samples were grown under large off-stoichiometric conditions to introduce defects like samarium vacancies and boron interstitials.
  • Resistivity measurements were conducted over a range to observe the transition from surface-dominated to bulk-dominated regimes.

Main Results:

  • Bulk resistivity of SmB6 was extended to a regime where surface conduction is significant.
  • Despite substantial disorder, the bulk resistivity exhibited a clear intrinsic thermally activated behavior.
  • The resistivity changed over 7-10 orders of magnitude, confirming insulating characteristics.

Conclusions:

  • Samarium hexaboride behaves as an ideal insulator, largely immune to disorder.
  • The intrinsic bulk properties of SmB6 are robust even under challenging growth conditions.
  • These findings highlight SmB6's potential for applications requiring stable insulating behavior.