Ultrafast dynamics of localized magnetic moments in the unconventional Mott insulator Sr2IrO4.
We report a time-resolved study of the ultrafast dynamics of the magnetic moments formed by the [Formula: see text] 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.
Linac Coherent Light Source, SLAC National Accelerator Laboratory, Menlo Park, CA 94720, USA. European XFEL, Hamburg 22761, Germany.
O
O
Krupin
G L
GL
Dakovski
B J
BJ
Kim
J W
JW
Kim
Jungho
J
Kim
S
S
Mishra
Yi-De
YD
Chuang
C R
CR
Serrao
W-S
WS
Lee
W F
WF
Schlotter
M P
MP
Minitti
D
D
Zhu
D
D
Fritz
M
M
Chollet
R
R
Ramesh
S L
SL
Molodtsov
J J
JJ
Turner