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Magnetic field induced orbital polarization in cubic YbInNi4: determining the quartet ground state using x-ray linear dichroism.

  • Author(s): Willers, T;
  • Cezar, JC;
  • Brookes, NB;
  • Hu, Z;
  • Strigari, F;
  • Körner, P;
  • Hollmann, N;
  • Schmitz, D;
  • Bianchi, A;
  • Fisk, Z;
  • Tanaka, A;
  • Tjeng, LH;
  • Severing, A
  • et al.
Abstract

We have been able to induce a linear dichroic signal in the Yb M(5) x-ray absorption white line of cubic YbInNi(4) by the application of a magnetic field. The nonzero integrated intensity of the magnetic field induced dichroic spectrum indicates a net noncubic 4f orbital polarization. A quantitative analysis of the temperature and field strength dependence establishes that the crystal-field ground state is a Γ(8) quartet. The results demonstrate the potential of magnetic field induced linear dichroism as a new powerful approach for the investigation of the degeneracy and orbital degrees of freedom of cubic heavy-fermion and Kondo systems.

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