The Working Groups for Methods for Characterization of Transport Phenomena in Energy Materials Scientific Division Large Scale Facilities
It is the mission of the Working Groups Methods for Characterization of Transport Phenomena in Energy Materials (G-AMCT) to apply neutron and photon scattering investigating the dynamic interplay of quasi-particle and charge transport in novel materials for energy conversion. Basic research on the interaction processes on the level of elementary excitations in the solid state and thus access to the meV to µeV energy resolution scale is key to a fundamental understanding of transport phenomena. This knowledge in turn is a necessary prerequisite for optimised design strategies for materials with low efficiency in propagating heat and high efficiency in propagating charge or even spin which is a particular focal point of energy research followed within the department. Operating the three-axis spectrometer for cold neutrons FLEXX as the major tool for spectroscopy of low-energy phonon and magnon excitations, the department holds specialised expertise in high resolution spectroscopy. While in-house research in the department exploits FLEXX for the strategically important field of energy materials research, the instrument receives international attention in user service where it is highly demanded as it benefits strongly from the advanced sample environment capabilities available at HZB. Expertise in advanced neutron methods based on Larmor labeling in particular the neutron resonance spin echo method is hosted in the department as this technique provides µeV resolution for dispersive excitations and complements standard neutron scattering with time-domain spectroscopy.
While neutron scattering to date is the unparalleled probe of choice photon scattering techniques need to be pushed into the high resolution domain. Building on key strengths in methodology and instrumentation projects, a particular emphasis in the department is to further develop its expertise towards cutting-edge photon technologies. An emerging goal is to provide innovation in instrumentation for materials characterisation exploiting inelastic photon scattering. Routes of engagement will be the development of holistic approaches of spectrometer design using Monte Carlo modeling, contributions to designing and prototyping of monochromating devices with optimized resolving power and photon flux transmission with the long-term goal of enabling sub-meV resolution photon scattering capabilities at future synchrotron radiation sources.