Working Group Neutron Scattering


Head: PD Dr. Frank Weber

The neutron-scattering group investigates the structure and dynamics of solids by means of elastic or inelastic neutron scattering. In addition, hard x-ray scattering measurements (elastic and inelastic) are carried out as well. Other experimental techniques, e.g. photoemission spectroscopy, are performed at large-scale user facilities when it is deemed necessary. The scientific focus is on lattice dynamical properties of solids, the interaction of the lattice with magnetic and electronic degrees of freedom and its evolution with extrinsic parameters such as chemical composition, pressure or temperature. We profit from close cooperation with the Theory of Quantum Materials department for ab-initio lattice dynamical calculations and the New Quantum Materials department for sample growth and characterization. Currently, we are particularly interested in phonon-mediated and iron-based superconductors, the physics of transition-metal monosilicides and charge-ordered materials. Until recently, we operated a thermal neutron triple-axis spectrometer at the (now closed) research reactor ORPHEE at CEA Saclay. Nonetheless, we were and are frequent guests at neutron and synchrotron user facilities around the world and will continue to be so.

We determined the correlation length ξ of nematic fluctuations in the iron-based superconductor Ba(Fe0.94Co0.06)2As2 from model fits (inset) to phonon dispersions measured via inelastic neutron scattering [10].
Our 4-circle x-ray diffractometer allows us to investigate structural properties of single crystals and powders over a wide temperature range 5 K < T < 700 K. Furthermore, it is essential to prepare samples for synchrotron and neutron scattering beam times. Students can learn the essentials of orientation in reciprocal space.

 

Current research interests:

 

 

Selected Publications

 

Members (in alphabetical order)
Name Tel
+49
-721
-608
Bld.-Room E-Mail
nazir khanGgn9∂kit edu
zehua liGgn9∂kit edu
kaushik senGgn9∂kit edu
frank weberGgn9∂kit edu