Coupled dynamics of long-range and internal spin cluster order in Cu$_{2}$OSeO$_{3}$

A. Sahasrabudhe; C. Boguschewski; D.I. Khomskii; F. Sekiguchi; J. Zhu; K. Budzinauskas; P. Becker; P.H.M. van Loosdrecht; P. Padmanabhan; R.B. Versteeg

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

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arxiv 1902.05329 v1 pith:AZYEI33T submitted 2019-02-14 cond-mat.str-el

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

R.B. Versteeg , J. Zhu , C. Boguschewski , F. Sekiguchi , A. Sahasrabudhe , K. Budzinauskas , P. Padmanabhan , P. Becker

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D.I. Khomskii P.H.M. van Loosdrecht

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Cu$_4$ triplet clusters form the relevant spin entity for the formation of long-range magnetic order in the cluster magnet Cu$_2$OSeO$_3$. 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.

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

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