Abstract
Time-resolved x-ray diffraction experiments on the half-doped single-layered manganite are used to monitor the ultrafast photoinduced dynamics of the structural distortion associated with the charge and orbital ordering (CO/OO). As in the nonlayered three-dimensional counterpart, the ordered phase melts in less than 100 fs after 800-nm photoexcitation and subsequently partially recovers due to thermal equilibration of electronic and vibrational systems. Photoexciting below the transition temperature of a second structural phase transition that occurs around 146 K (deep inside the CO/OO phase) releases this structural transition, but progresses on a much slower timescale. This additional reduction of crystal symmetry, which we ascribe to a further tilt of the oxygen octahedra, can thus be considered to be only weakly coupled to CO/OO. Furthermore, static hard-x-ray and resonant soft-x-ray diffraction at the edges experiments identify correlations between structural distortions and electronic order in thermal equilibrium.
2 More- Received 5 December 2019
- Accepted 24 January 2020
- Corrected 29 April 2020
DOI:https://doi.org/10.1103/PhysRevB.101.075119
©2020 American Physical Society
Physics Subject Headings (PhySH)
Corrections
29 April 2020
Correction: A second affiliation has been added for the 15th author.