Thursday, October 29, 2009, 3:00 pm — Seminar Room, Bldg. 725
The design and performance of the FEMTO laser slicing source operated at the Swiss Light Source [1] is presented. The spatiotemporal stability of the source allows to perform pump-probe grazing incidence x-ray diffraction with time resolution 200 fs. Options to increase the flux at the experimental station by 1-2 orders of magnitude are discussed. We report on experiments where the photoinduced non-equilibrium carrier and structural dynamics in Peierls distorted systems (Bi, Te) has been studied [2[. In a recent experiment we measured the structural response to ultrafast melting of charge and orbital order in a manganite (LCMO) [3]. We find that in addition to Angstrom spatial resolution a time resolution of ultimately 10 fs will be needed to follow the coupling between different degrees of freedom (i.e. charge, orbital, spin and lattice) and the dynamics of phase transitions between different competing phases in such strongly correlated materials. For this we pursue to extend our present experiments to resonant and non-resonant scattering experiments both in the soft and hard x-ray range at existing FEL facilities [4].
[1] P. Beaud et al., PRL 99 (2007), 174801.
[2] S.L. Johnson et al., PRL 100 (2008), 155501 and PRL 102 (2009) 175503.
[3] P. Beaud et al., submitted.
[4] G. Ingold et al., Z. Kristallgr. 223 (2008) 292.
Hosted by: Chi-Chang Kao
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