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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, Jungho;
  • Mishra, S;
  • Chuang, Yi-De;
  • Serrao, CR;
  • Lee, W-S;
  • Schlotter, WF;
  • Minitti, MP;
  • Zhu, D;
  • Fritz, D;
  • Chollet, M;
  • Ramesh, R;
  • Molodtsov, SL;
  • Turner, JJ
  • et al.
Abstract

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.

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