A New Magnetic Phase and Magnetic Interactions in Skyrmionic Insulator Cu<sub>2</sub>OSeO<sub>3</sub>
ORAL
Abstract
Copper(II) oxy-selenite (Cu₂OSeO₃), unlike most skyrmionic materials which are metallic, is an insulating and structurally chiral compound with several strong infrared-active phonons that exhibit anomalous behavior across multiple magnetic transitions at low temperatures and fields. Most previous spectroscopic studies have focused on its skyrmionic nature at low fields and frequencies. Here, we present experimental data from circular and vortex polarized magneto-infrared transmission in the Voight and Faraday configurations, ellipsometry, and circularly polarized Raman spectroscopy, revealing a new magnetic phase that develops above 2 T, characterized by distinct magnetic modes and phonon interactions. In the Faraday configuration we observed strong circular and vortex-beam dichroism for the coupled magnetic-phonon modes in magnetic fields up to 7 T.
*The NSF MPS-ASCEND Award #2316535 supported the experiments and data analysis by V.A.M. Work at the New Jersey Institute of Technology was supported by the U.S. Department of Energy under Contract No. DEFG02-07ER46382.Work at the National Synchrotron Light Source II at Brookhaven National Laboratory was funded by the DOE DE-AC9806CH10886. Use of the 22-IR-1(FIS) beamline was supported by the NSF EAR−2223273 (Synchrotron Earth and Environmental Science, SEES) and Chicago/DOE Alliance Center (CDAC) under the DOE-NNS cooperative agreement DE-NA-0003975.
–
Presenters
-
Vladimir A Martinez
- New Jersey Institute of Technology