Ultrafast dynamics of localized magnetic moments in the unconventional Mott insulator Sr2IrO4

Publication Type:

Journal Article

Authors:

O. Krupin; G.L. Dakovski; B.J. Kim; J.W. Kim; J. Kim; S. Mishra; Y.-D. Chuang; C.R. Serrao; W.-S. Lee; W.F. Schlotter; M.P. Minitti; D. Zhu; D. Fritz; M. Chollet; Ramamoorthy Ramesh; S.L. Molodtsov; J.J. Turner

Source:

Journal of Physics Condensed Matter, Institute of Physics Publishing, Volume 28, Number 32 (2016)

Keywords:

electrons, Free electron lasers, Iridates, Localized magnetic moments, Magnetic moments, Magnetism, Optical pumping, Relaxation time scale, Resonant diffraction, Resonant x-ray diffraction, Spin-orbit couplings, Time measurement, Time resolved studies, X ray diffraction, X-ray studies

Abstract:

We report a time-resolved study of the ultrafast dynamics of the magnetic moments formed by the states in Sr2IrO4 by directly probing the localized iridium 5d magnetic state through resonant x-ray diffraction. Using optical pump-hard x-ray probe measurements, two relaxation time scales were determined: a fast fluence-independent relaxation is found to take place on a time scale of 1.5 ps, followed by a slower relaxation on a time scale of 500 ps-1.5 ns. © 2016 IOP Publishing Ltd.

Notes:

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