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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 M5x-ray absorption white line of cubic YbInNi4by 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 Γ8quartet. 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. © 2011 American Physical Society.

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