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Technical University of Munich

Neutrons worm the last secrets of the crystal

Instrumente, POLI, Wissenschaft |

An international research group led by Dr. Vladimir Hutanu has recently been able to measure the magnetic parameters of the Ba2CoGe2O7-crystal at the neutron diffractometer POLI much more accurately than it was previously possible.
The capsule left is the analyzer of the experiment, the right is the polarizer; the crystal is cooled well in the upright standing container in the center of the image. (Photo: TUM)
The capsule left is the analyzer of the experiment, the right is the polarizer; the crystal is cooled well in the upright standing container in the center of the image. (Photo: TUM)

27.05.2014

The Garching scientist from the RWTH Aachen has applied the so-called 3D polarization analysis with hot neutrons. For the first time, the proportion each domain type in the overall crystal and its change when a magnetic and electric field could be examined and accurately determined. The crystal reacted very quickly to the change of magnetic field and already a tenth of the theoretical field strength was enough to realize a single domain structure. With the help of this unique attempts in the research group succeeded in demonstrating experimentally that only one of the many theories fits to the measurement results.

The results are published in Physical Review B (Phys Rev B 89, 064403 (2014)) .

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