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

Cu4 triplet clusters form the relevant spin entities for the formation of long-range magnetic order in the cluster Mott insulator Cu2OSeO3. Using time-resolved Raman spectroscopy, we probed photoinduced spin and lattice dynamics in this cluster magnet. Multiple picosecond-decade spin-lattice relaxat...

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Bibliographic Details
Published in:Physical review. B 2019-08, Vol.100 (6), p.1
Main Authors: Versteeg, R B, Zhu, J, Boguschewski, C, Sekiguchi, F, Sahasrabudhe, A, Budzinauskas, K, Padmanabhan, P, Becker, P, Khomskii, D I, van Loosdrecht, P H M
Format: Article
Language:English
Subjects:
Clusters
Insulators
Order parameters
Raman spectroscopy
Separation
Spin dynamics
Spin-lattice relaxation
Online Access:Get full text
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Summary:Cu4 triplet clusters form the relevant spin entities for the formation of long-range magnetic order in the cluster Mott insulator Cu2OSeO3. Using time-resolved Raman spectroscopy, we probed photoinduced spin and lattice dynamics in this cluster magnet. Multiple picosecond-decade spin-lattice relaxation dynamics is observed, evidencing a separation of the order parameter dynamics into disordering of long-range and cluster-internal order on the tens and 100s on the picosecond timescale, respectively. We argue that this separation originates in vastly different interaction strengths between low- and high-energy spin cluster excitations and acoustic phonons. Our results exemplify the double-order parameter dynamics intrinsic to the novel quantum material class of cluster Mott insulators.
ISSN:2469-9950
2469-9969
DOI:10.1103/PhysRevB.100.064401