2019/02/14 by R. B. Versteeg, J. Zhu, Jingyi Zhu +12
Chemistry · Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Chemistry #Cluster (spacecraft) #Computer science #Condensed matter physics #Magnetic and transport properties of perovskites and related materials #Mott insulator #Order (exchange) #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Raman spectroscopy #Relaxation (psychology) #Spin (aerodynamics) #Thermodynamics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.100.064401
published as Phys. Rev. B 100, 064401 (2019) · 6 pages, 5 figures
arxiv created 2019/02/14 · openalex created_date 2019/02/21 · openalex publication_date 2019/08/02 · arxiv updated 2019/08/07 · openalex updated_date 2026/08/05
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.