%0 Journal Article
%K electrons
%K Magnetism
%K Free electron lasers
%K X ray diffraction
%K Magnetic moments
%K Spin-orbit couplings
%K Optical pumping
%K Time measurement
%K iridates
%K Localized magnetic moments
%K Relaxation time scale
%K Resonant diffraction
%K Resonant x-ray diffraction
%K Time resolved studies
%K X-ray studies
%A O Krupin
%A G.L Dakovski
%A B.J Kim
%A J.W Kim
%A J Kim
%A S Mishra
%A Y.-D Chuang
%A C.R Serrao
%A W.-S Lee
%A W.F Schlotter
%A M.P Minitti
%A D Zhu
%A D Fritz
%A M Chollet
%A Ramamoorthy Ramesh
%A S.L Molodtsov
%A J.J Turner
%B Journal of Physics Condensed Matter
%D 2016
%G eng
%I Institute of Physics Publishing
%R 10.1088/0953-8984/28/32/32LT01
%T Ultrafast dynamics of localized magnetic moments in the unconventional Mott insulator Sr2IrO4
%V 28
%X 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.