T. Willers

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 Hunds rule ground state of the non-centrosymmetric 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.

Crystal-field ground state of the orthorhombic Kondo insulator CeRu2Al10

We have succeeded in establishing the crystal-field ground state of CeRu2Al10, an orthorhombic intermetallic compound recently identified as a Kondo insulator. Using polarization dependent soft x-ray absorption spectroscopy at the Ce M4,5 edges, together with input from inelastic neutron and magnetic susceptibility experiments, we were able to determine unambiguously the orbital occupation of the 4f shell and to explain quantitatively both the measured magnetic moment along the easy a axis and the small ordered moment along the c-axis. The results provide not only a platform for a realistic modeling of the spin and charge gap of CeRu2Al10, but demonstrate also the potential of soft x-ray absorption spectroscopy to obtain information not easily accessible by neutron techniques for the study of Kondo insulators in general.

Crystal-field and Kondo-scale investigations of CeMIn5 (M = Co, Ir, and Rh): A combined x-ray absorption and inelastic neutron scattering study

Linear-polarized soft-x-ray absorption (XAS) and inelastic neutron scattering (INS) experiments have been performed on

Local symmetry and magnetic anisotropy in multiferroic MnWO4 and antiferromagnetic CoWO4 studied by soft x-ray absorption spectroscopy

\text{Ce}M{\text{In}}_{5}

Correlation between ground state and orbital anisotropy in heavy fermion materials

with

Determining the In-Plane Orientation of the Ground-State Orbital of CeCu2Si2

M=\text{Rh}

CeRu4Sn6: a strongly correlated material with nontrivial topology.

, Ir, and Co to determine the crystal-field scheme and characteristic Kondo temperatures

Replacing the solid needle by a liquid one when measuring static and advancing contact angles

{T}^{\ensuremath{\ast}}

Orbital occupation and magnetism of tetrahedrally coordinated iron in CaBaFe4O7

for the hybridization between

Spectroscopic determination of crystal-field levels in CeRh2Si2 and CeRu2Si2 and of the 4f0 contributions in CeM2Si2 (M=Cu, Ru, Rh, Pd, and Au)

4f