Group leader

Andrea Severing
Andrea Severing
Group leader
Phone:+49 221 470-2608

University of Cologne


Sundermann, Martin
Martin Sundermann
Visiting scientist

Fax: +49 351 4646-4902

Severing - Local Electronic Structure of f electron materials

Severing - Local Electronic Structure of f electron materials

The focus of our research is the synchrotron based investigation of the f orbital occupation in Heavy Fermion compounds.

In Heavy Fermion materials not only the proximity of superconductivity and magnetism is intriguing, but also the important question remains why among chemically and structurally similar compounds some are superconducting and/or Kondo-like, and others are antiferromagnetic. We investigate to what extend the crystal-electric-field has an impact on the formation of a certain ground state and therefore (re)measure the f orbital occupation with methods which promise a greater accuracy than standard techniques. In particular we apply x-ray absorption spectroscopy (XAS) and inelastic x-ray scattering (IXS).  Especially non-resonant IXS allows new insights due to the possibility of studying excitations beyond the dipole limit. 

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