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Correlations between electronic order and structural distortions and their ultrafast dynamics in the single-layer manganite Pr0.5Ca1.5MnO4

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Rettig,  Laurenz
Physical Chemistry, Fritz Haber Institute, Max Planck Society;
Swiss Light Source, Paul Scherrer Institute;

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PhysRevB.101.075119.pdf
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Citation

Porer, M., Rettig, L., Bothschafter, E. M., Esposito, V., Versteeg, R. B., Loosdrecht, P. H. M. v., et al. (2020). Correlations between electronic order and structural distortions and their ultrafast dynamics in the single-layer manganite Pr0.5Ca1.5MnO4. Physical Review B, 101(7): 075119. doi:10.1103/PhysRevB.101.075119.


Cite as: https://hdl.handle.net/21.11116/0000-0005-E990-1
Abstract
Time-resolved x-ray diffraction experiments on the half-doped single-layered manganite Pr0.5Ca1.5MnO4 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 Pr0.5Ca1.5MnO4 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 MnL2,3 edges experiments identify correlations between structural distortions and electronic order in thermal equilibrium.