Time-dependent charge-order and spin-order recovery in striped systems

Y. F. Kung, W.-S. Lee, C.-C. Chen, A. F. Kemper, A. P. Sorini, B. Moritz, and T. P. Devereaux
Phys. Rev. B 88, 125114 – Published 9 September 2013

Abstract

Using time-dependent Ginzburg-Landau theory, we study the role of amplitude and phase fluctuations in the recovery of charge-stripe and spin-stripe phases in response to a pump pulse that melts the orders. For parameters relevant to the case where charge order precedes spin order thermodynamically, amplitude recovery governs the initial time scales, while phase recovery controls behavior at longer times. In addition to these intrinsic effects, there is a longer spin reorientation time scale related to the scattering geometry that dominates the recovery of the spin phase. Coupling between the charge and spin orders locks the amplitude and similarly the phase recovery, reducing the number of distinct time scales. Our results well reproduce the major experimental features of pump-probe x-ray diffraction measurements on the striped nickelate La1.75Sr0.25NiO4. They highlight the main idea of this work, which is the use of time-dependent Ginzburg-Landau theory to study systems with multiple coexisting order parameters.

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  • Received 14 June 2013

DOI:https://doi.org/10.1103/PhysRevB.88.125114

©2013 American Physical Society

Authors & Affiliations

Y. F. Kung1,2, W.-S. Lee2, C.-C. Chen3, A. F. Kemper4, A. P. Sorini2,5, B. Moritz2,6, and T. P. Devereaux2,7

  • 1Department of Physics, Stanford University, Stanford, California 94305, USA
  • 2Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory and Stanford University, Menlo Park, California 94025, USA
  • 3Advanced Photon Source, Argonne National Laboratory, Lemont, Illinois 60439, USA
  • 4Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, California 94720, USA
  • 5Physics Division, Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 6Department of Physics and Astrophysics, University of North Dakota, Grand Forks, North Dakota 58202, USA
  • 7Geballe Laboratory for Advanced Materials, Stanford University, Stanford, California 94305, USA

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Vol. 88, Iss. 12 — 15 September 2013

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