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MA: Fachverband Magnetismus
MA 9: Cooperative Phenomena: Spin Structures and Magnetic Phase Transitions
MA 9.7: Talk
Monday, March 27, 2023, 16:45–17:00, HSZ 401
Field-induced magnetic excitations in phases II and II′ of Ce3Pd20Ge6 — •Federico Mazza1, Jakob Lass2, Daniel Mazzone2, Stewart Ross3, Eun Sang Choi4, Martin Nikolo5, Xinlin Yan1, Andrey Prokofiev1, Silke Paschen1, and Dmytro S. Inosov6 — 1TU Wien, Austria — 2PSI, Villigen, Switzerland — 3ISIS, Didcot, UK — 4Florida State University, Tallahassee, USA — 5St. Louis University, USA — 6TU Dresden, Germany
Ce3Pd20Ge6 is known for its unique quantum phase transitions between antiferromagnetic ordering phase III and ferroquadrupolar phases II and II′. Using torque magnetometry at subkelvin temperatures, we were able to map the phase diagram in field and momentum space, here we find the crossover between phases III-II′ at 1.5 T and II′-II at 8 T. In addition, with inelastic neutron scattering we investigate dispersive collective excitations with a strong magnetic field dependence for B ∥ (110), revealing a magnon soft mode (Goldstone mode) at (001) for phase III and (111) for phases II and II′. At 4 meV we discover the presence of two (CEF) excitations exhibiting a weak dispersion best seen in the (HH1) direction. They are degenerate in the absence of magnetic field but split progressively as the field is increased.