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

  • Author(s): Krupin, O
  • Dakovski, GL
  • Kim, BJ
  • Kim, JW
  • Kim, J
  • Mishra, S
  • Chuang, YD
  • Serrao, CR
  • Lee, WS
  • Schlotter, WF
  • Minitti, MP
  • Zhu, D
  • Fritz, D
  • Chollet, M
  • Ramesh, R
  • Molodtsov, SL
  • Turner, JJ
  • et al.
Abstract

© 2016 IOP Publishing Ltd. We report a time-resolved study of the ultrafast dynamics of the magnetic moments formed by the states in Sr2IrO4by 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.

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