Regensburg 2016 – scientific programme
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O: Fachverband Oberflächenphysik
O 86: Ultrafast Surface Dynamics I
O 86.9: Talk
Thursday, March 10, 2016, 17:00–17:15, S052
Femtosecond time-resolved photoemission of the photo-induced valence transition in YbInCu4 — •Florian Diekmann, Lars-Philip Oloff, Kerstin Hanff, Michael Bauer, and Kai Rossnagel — Institut für Experimentelle und Angewandte Physik, Universität Kiel, 24098 Kiel, Germany
Below a temperature of 42 K, YbInCu4 displays a first-order isostructural transition from a semimetallic, paramagnetic local-moment phase with an Yb valence of 2.94 to a metallic, non-magnetic, valence-fluctuating heavy-fermion phase with a Yb valence of 2.84 [1]. Here, we use time- and angle-resolved extreme ultraviolet photoemission spectroscopy to directly probe the photo-induced valence transition in the electronic structure relaxation dynamics near the Fermi level on the femtosecond time scale. Temperature- and pump fluence-dependent results are presented and compared to the results of time-resolved reflectivity measurements.
[1] H. Sato et al., Phys. Rev. Lett. 93, 246404 (2004).