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Effects of Eu doping on SmB 6 single crystals

  • Author(s): Yeo, S
  • Song, K
  • Hur, N
  • Fisk, Z
  • Schlottmann, P
  • et al.

The various phases in Sm Eu B are investigated based on magnetic susceptibility, resistivity, and Hall effect measurements. The end compounds are a Kondo insulator (SmB ) and a polaronic ferromagnet (EuB ). For x≈ 0.2, the ground state undergoes a transition from a Kondo insulator to an antiferromagnetic (AF) insulator phase. Further doping induces a transition to an AF metal at x≈ 0.4. The spin gap is reduced rapidly with the Eu substitution, while there is a charge gap up to x≈ 0.4. The Hall effect indicates a dramatic decrease in the carrier density at low temperatures (T) for the Kondo insulator regime, whereas, the carrier density is almost independent of T in the AF metallic phase. © 2012 American Physical Society. 1-x x 6 6 6

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