Determining the crystal-field ground state in rare earth heavy fermion materials using soft-x-ray absorption spectroscopy.

  title={Determining the crystal-field ground state in rare earth heavy fermion materials using soft-x-ray absorption spectroscopy.},
  author={Philipp Hansmann and Andrea Severing and Z. Hu and Maurits W. Haverkort and C. F. Chang and S. Klein and Arata Tanaka and H. H. Hsieh and H.J. Lin and C. T. Chen and B. F̊ak and Pascal Lejay and Liu Hao Tjeng},
  journal={Physical review letters},
  volume={100 6},
We infer that soft-x-ray absorption spectroscopy is a versatile method for the determination of the crystal-field ground state symmetry of rare earth heavy fermion systems, complementing neutron scattering. Using realistic and universal parameters, we provide a theoretical mapping between the polarization dependence of Ce M(4,5) spectra and the charge distribution of the Ce 4f states. The experimental resolution can be orders of magnitude larger than the 4f crystal-field splitting itself. To… 

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