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Quantum Oscillations in Flux-Grown SmB_{6} with Embedded Aluminum.

S M Thomas1,2, Xiaxin Ding3, F Ronning2

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Torque magnetization detected de Haas-van Alphen oscillations in samarium hexaboride (SmB_{6}) crystals. These oscillations originated from embedded aluminum inclusions, not the SmB_{6} itself.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Topological materials

Background:

  • Samarium hexaboride (SmB_{6}) is a prime candidate for a topological Kondo insulator.
  • Topological Kondo insulators exhibit unique surface conduction properties at low temperatures.

Purpose of the Study:

  • To investigate the origin of de Haas-van Alphen (dHvA) oscillations in SmB_{6} crystals.
  • To characterize the role of aluminum flux inclusions in SmB_{6} synthesis.

Main Methods:

  • Torque magnetization measurements were employed to detect dHvA oscillations.
  • Bulk susceptibility and transport measurements were conducted.
  • Analysis of aluminum crystal orientation within SmB_{6}.

Main Results:

  • dHvA oscillations were observed in SmB_{6} crystals containing embedded aluminum.
  • Aluminum inclusions were found to crystallize in a preferred orientation within the SmB_{6} cubic lattice.
  • Aluminum's presence was confirmed by bulk susceptibility but not detected in transport measurements.

Conclusions:

  • The observed dHvA oscillations in SmB_{6} are attributed to aluminum flux inclusions.
  • Aluminum inclusions do not appear to influence the transport properties of SmB_{6}.
  • Understanding these inclusions is crucial for accurate characterization of SmB_{6} properties.