Ultrafast Dynamics of Localized Magnetic Moments in the Unconventional Mott Insulator Sr2IrO4

Publication Type:

Journal Article

Authors:

Oleg Krupin; Georgi L. Dakovski; B. J. Kim; Jong-Woo Kim; Jungho Kim; Shrawan Mishra; Yi-De Chuang; Claudy R. Serrao; Wei-Sheng Lee; William F. Schlotter; Michael P. Minitti; Diling Zhu; David M. Fritz; Matthieu Chollet; Ramamoorthy Ramesh; Serguei L. Molodtsov; Joshua J. Turner

Source:

Journal of Physics: Condensed Matter, Volume 28, p.32LT01 (2016)

Date Published:

06/2016

Abstract:

We report a time-resolved study of the ultrafast dynamics of the magnetic moments formed by the Jeff = 1/2 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.