Berlin 2018 – wissenschaftliches Programm
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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur
KFM 27: Postersession KFM
KFM 27.34: Poster
Donnerstag, 15. März 2018, 15:00–17:00, Poster E
Single-crystal diffractometers HEiDi and POLI at MLZ: (Un)polarised neutrons to probe crystallographic and magnetic domains — •Andrew Sazonov1,2, Martin Meven1,2, Vladimir Hutanu1,2, and Georg Roth1 — 1RWTH Aachen, Institute of Crystallography, D-52056 Aachen, Germany — 2Jülich Centre for Neutron Science at MLZ, D-85748 Garching, Germany
HEiDi and POLI are the only single-crystal neutron diffractometers in Germany and two of the very few in the world which are located at a hot neutron source to enlarge the flux of neutrons with short wavelengths. It allows to minimize the absorption problems associated with certain elements and to explore extremely large portions of reciprocal space. HEiDi is a typical 4-circle diffractometer with Eulerian cradle for detailed studies on crystal and magnetic structures in the temperature range 2.5–1300 K. POLI is an independent diffractometer, which extends the possibilities of HEiDi to the milli-Kelvin range and external magnetic fields as well as offers in addition different types of polarized neutron techniques: Flipping-ratio measurements in applied magnetic field for ferromagnetic and paramagnetic materials and spherical neutron polarimetry in zero field for more complex magnetic structures. Due to their possibilities, both instruments contribute to many topics, e.g. in the energy and information sector. Here, on examples of multiferroic and superconducting materials, we give an overview of the instruments possibilities in studying of crystal and magnetic structures and phase transitions of solids in general, and their crystallographic and magnetic domains (microstructures) in particular.