Coupled dynamics of long-range and cluster-internal spin order in the cluster Mott insulator Cu2OSeO3

Abstract

Cu4 triplet clusters form the relevant spin entity for the formation of long-range magnetic order in the cluster magnet Cu2OSeO3. Using time-resolved Raman spectroscopy, we probed photoinduced spin and lattice dynamics in this Mott insulator. Multiple ps-decade spin-lattice relaxation dynamics is observed, evidencing a separation of the order parameter dynamics into disordering of long-range and internal spin cluster order. Our study exemplifies the double order parameter dynamics of generalized molecular crystals of charge, spin, and orbital nature.

Inelastic light scattering in the spin cluster Mott insulator Cu2OSeO3

“…[17][18][19] The spin cluster excitation nature in the paramagnetic phase has only been minimally discussed. 20,21 A multitude of the high-energy spin cluster excitations have been observed in different Raman studies, [21][22][23] and used in a time-resolved Raman study to track photoinduced spin cluster disordering, 21 but insight in the underlying magnetic light scattering mechanism is still incomplete. We address these issues in greater detail in this article.…”

Slowdown of photoexcited spin dynamics in the non-collinear spin-ordered phases in skyrmion host GaV4S8

“…Therefore, detailed investigation of the coherent magnons depending on the nature of skyrmion ordering is highly demanded for the coherent photocontrol of skyrmions. Furthermore, laser-based time-resolved studies also shed light on the thermal properties of the spin system through the observation of incoherent relaxation dynamics 24,29,30 . The ability to control thermal currents is of paramount importance, especially for realizing prospective high-density spintronic information processing units.…”