Berlin 2015 – scientific programme
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MA: Fachverband Magnetismus
MA 18: PhD symposium of the Division of Magnetism and the jDPG 2015: Quantum Phase Transitions: Emergent phenomena beyond elementary excitations
MA 18.3: Talk
Tuesday, March 17, 2015, 10:45–11:00, EB 301
Neutron-Depolarisation Imaging of the Ferromagnetic Quantum Phase Transition in ZrZn2 — •Philipp Schmakat1,2, Marco Halder1, Georg Brandl1,2, Michael Schulz2, Stephen Hayden3, Robert Georgii2, Peter Böni1, and Christian Pfleiderer1 — 1Physik Department E21, Technische Universität München, Germany — 2Forschungs-Neutronenquelle Heinz Maier-Leibnitz, D-85748 Garching, Germany — 3H. H. Wills Physics Laboratory, University of Bristol, Bristol BS8 1TL, United Kingdom
When a polarised neutron beam traverses a ferromagnetic material, the orientation and strength of the polarisation changes sensitively as a function of the ferromagnetic moment and the size of the ferromagnetic domains. We have developed an experimental set up that allows to perform neutron depolarisation imaging as a function of magnetic field. In a study of the ferromagnetic quantum phase transition in the weak itinerant ferromagnet ZrZn2 under pressure we find, that a peculiar field dependence of the neutron depolarisation survives on the paramagnetic side of the temperature versus pressure phase diagram. This provides putative evidence for the emergence of complex magnetic textures.