Crystal-field ground state of the noncentrosymmetric superconductor CePt3Si: A combined polarized soft x-ray absorption and polarized neutron study

We determined the crystal-field split Hund's rule ground state of the noncentrosymmetric heavy fermion superconductor CePt3Si with polarization dependent soft x-ray absorption spectroscopy (XAS) and polarized neutron scattering. We are also able to give the sequence of the crystal-field states from the temperature evolution of the linear dichroic signal in the XAS. The quantitative analysis of the XAS temperature dependence together with the neutron transition energies complete the identification of the crystal-field level scheme.