Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 4: f-Electron Systems
TT 4.12: Talk
Monday, March 18, 2024, 12:45–13:00, H 3005
Magnetic behaviour of UNi4B in high magnetic fields — •Philip Schröder1, Jannis Willwater1, Stefan Süllow1, Manfred Reehuis2, Hiroshi Amitsuka3, Bachir Ouladdiaf4, Romain Sibille5, Milan Klicpera6, Michael Vališka6, Jiří Pospíšil6, and Vladimír Sechovský6 — 1Institut für Physik der Kondensierten Materie, TU Braunschweig, Germany — 2Helmholtz-Center Berlin for Materials and Energy, Berlin, Germany — 3Department of Physics, Hokkaido University, Japan — 4Institute Laue-Langevin, Grenoble, France — 5Paul Scherrer Institut, Villingen, Switzerland — 6Faculty of Mathematics and Physics, Charles University, Prague, Czech Republic
UNi4B is a rare example of an ising-like f-electron magnet with a highly unusual form of partial antiferromagnetic ordering at TN = 19.5 K. Only two thirds of the U-ions participate in long-range magnetic order and form a vortex-like magnetic structure in the pseudo-hexagonal plane. Measurements of the elastic constants verified a complex and highly anisotropic phase diagram, including a plethora of magnetic high field phases. Here we present a comprehensive study of the evolution of the ordered state of UNi4B in its high field spin-reorienting phases III and III‘ on a microscopic level. We discuss the results of multiple elastic neutron scattering experiments on single crystalline UNi4B in magnetic fields up to 10 T for H||b and in magnetic fields up to 12 T for H||c. This behaviour might indicate a spin-reorientation and a previously proposed quadrupolar contribution of the non ordering third of U-ions.