The department uses neutron and X-ray diffraction and spectroscopy as well as optical spectroscopy and Raman scattering to explore the structure and dynamics of materials with strong electron correlations. We also have a strong effort in the development of new spectroscopic methods. As the close collaboration between experimentalists and theorists is essential for the progress in this field, a small theory group operates within the department.
Eva Benckiser wins the Walter Schottky Prize
Eva Benckiser received the Walter-Schottky-Prize of the German Physical Society for her outstanding contributions to research on complex materials with correlated electrons. By developing x-ray spectroscopic methods she obtained novel insight into the electronic structure of metal-oxide interfaces and created a promising basis for targeted manipulation of their magnetic and transport properties.
Uniaxial pressure control of competing orders in a high-temperature superconductor
Cuprate superconductors are known to harbor charge order in part of their phase diagram. The order has a two-dimensional (2D) character at zero magnetic field, whereas a 3D order appears at high fields. In x-ray diffraction measurements under high uniaxial pressure, we have discovered Bragg reflections characteristic of 3D charge order even at zero magnetic field. We also demonstrated a soft phonon mode that is associated with the formation of 3D order. The results provide insights into the normal-state properties of cuprates and illustrate the potential of uniaxial-pressure control of competing orders in quantum materials.
H.H. Kim, S.M. Souliou et al., Science 362, 1040 (2018)