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

Here, we report a time-resolved study of the ultrafast dynamics of the magnetic moments formed by the $${{J}_{\text{eff}}}=1/2$$ 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.
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [4] ;  [5] ;  [6] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [5] ;  [7] ;  [2]
  1. SLAC National Accelerator Lab., Menlo Park, CA (United States); European X-ray Free-Electron Laser (XFEL), Hamburg (Germany)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Univ. of California, Berkeley, CA (United States)
  6. Stanford Univ., Menlo Park, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  7. European X-ray Free-Electron Laser (XFEL), Hamburg (Germany); TU Bergakademie Freiberg, Freiberg (Germany); IT MO Univ., St. Petersburg (Russia)
Publication Date:
OSTI Identifier:
1332926
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Journal of Physics. Condensed Matter
Additional Journal Information:
Journal Volume: 28; Journal Issue: 32; Journal ID: ISSN 0953-8984
Publisher:
IOP Publishing
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY iridates; spin-orbit coupling materials; free-electron laser science; resonant diffraction; ultra-fast x-ray studies; magnetism