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Nonequilibrium lattice-driven dynamics of stripes in nickelates using time-resolved x-ray scattering

  • Author(s): Lee, WS
  • Kung, YF
  • Moritz, B
  • Coslovich, G
  • Kaindl, RA
  • Chuang, YD
  • Moore, RG
  • Lu, DH
  • Kirchmann, PS
  • Robinson, JS
  • Minitti, MP
  • Dakovski, G
  • Schlotter, WF
  • Turner, JJ
  • Gerber, S
  • Sasagawa, T
  • Hussain, Z
  • Shen, ZX
  • Devereaux, TP
  • et al.
Abstract

© 2017 American Physical Society. We investigate the lattice coupling to the spin and charge orders in the striped nickelate, La1.75Sr0.25NiO4, using time-resolved resonant x-ray scattering. Lattice-driven dynamics of both spin and charge orders are observed when the pump photon energy is tuned to that of an Eu bond- stretching phonon. We present a likely scenario for the behavior of the spin and charge order parameters and its implications using a Ginzburg-Landau theory.

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