4.8 Article

Real-Time Manifestation of Strongly Coupled Spin and Charge Order Parameters in Stripe-Ordered La1.75Sr0.25NiO4 Nickelate Crystals Using Time-Resolved Resonant X-Ray Diffraction

Journal

PHYSICAL REVIEW LETTERS
Volume 110, Issue 12, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.110.127404

Keywords

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Funding

  1. U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering [DE-AC02-76SF00515]
  2. SLAC National Accelerator Laboratory (SLAC)
  3. Stanford Institute for Materials and Energy Science
  4. SLAC Stanford Synchrotron Radiation Lightsource
  5. SLAC Stanford PULSE Institute
  6. Lawrence Berkeley National Laboratory (LBNL) Advanced Light Source
  7. LBNL Materials Sciences Division
  8. LBNL Engineering Division
  9. Alexander-von-Humboldt Foundation
  10. Department of Defense (DoD) through the National Defense Science and Engineering Graduate (NDSEG) Fellowship
  11. LCLS
  12. Stanford University-SIMES
  13. LBNL
  14. University of Hamburg through the BMBF Priority Program [FSP 301]
  15. Center for Free Electron Laser Science (CFEL)
  16. [DE-AC02-05CH11231]
  17. Grants-in-Aid for Scientific Research [25610089] Funding Source: KAKEN

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We investigate the order parameter dynamics of the stripe-ordered nickelate, La1.75Sr0.25NiO4, using time-resolved resonant x-ray diffraction. In spite of distinct spin and charge energy scales, the two order parameters' amplitude dynamics are found to be linked together due to strong coupling. Additionally, the vector nature of the spin sector introduces a longer reorientation time scale which is absent in the charge sector. These findings demonstrate that the correlation linking the symmetry-broken states does not unbind during the nonequilibrium process, and the time scales are not necessarily associated with the characteristic energy scales of individual degrees of freedom. DOI. 10.1103/PhysRevLett.110.127404

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