Pontius, N., Beye, M., Trabant, C., Mitzner, R., Sorgenfrei, F., Kachel, T., Woestmann, M., Roling, S., Zacharias, H., Ivanov, R., Treusch, R., Buchholz, M., Metcalf, P., Schuessler-Langeheine, C. and Foehlisch, A. (2018). Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment. Struct. Dyn.-US, 5 (5). MELVILLE: AMER INST PHYSICS. ISSN 2329-7778

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Abstract

We present a general experimental concept for jitter-free pump and probe experiments at free electron lasers. By generating pump and probe pulse from one and the same X-ray pulse using an optical split-and-delay unit, we obtain a temporal resolution that is limited only by the X-ray pulse lengths. In a two-color X-ray pump and X-ray probe experiment with sub 70 fs temporal resolution, we selectively probe the response of orbital and charge degree of freedom in the prototypical functional oxide magnetite after photoexcitation. We find electronic order to be quenched on a time scale of (30 +/- 30) fs and hence most likely faster than what is to be expected for any lattice dynamics. Our experimental result hints to the formation of a short lived transient state with decoupled electronic and lattice degree of freedom in magnetite. The excitation and relaxation mechanism for X-ray pumping is discussed within a simple model leading to the conclusion that within the first 10 fs the original photoexcitation decays into low-energy electronic excitations comparable to what is achieved by optical pump pulse excitation. Our findings show on which time scales dynamical decoupling of degrees of freedom in functional oxides can be expected and how to probe this selectively with soft X-ray pulses. Results can be expected to provide crucial information for theories for ultrafast behavior of materials and help to develop concepts for novel switching devices. (C) 2018 Author(s).

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Pontius, N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beye, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Trabant, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Mitzner, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Sorgenfrei, F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Kachel, T.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Woestmann, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Roling, S.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Zacharias, H.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ivanov, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Treusch, R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Buchholz, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Metcalf, P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schuessler-Langeheine, C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Foehlisch, A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-174072
DOI: 10.1063/1.5042847
Journal or Publication Title: Struct. Dyn.-US
Volume: 5
Number: 5
Date: 2018
Publisher: AMER INST PHYSICS
Place of Publication: MELVILLE
ISSN: 2329-7778
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
FREE-ELECTRON LASER; TRANSITION; OPERATIONMultiple languages
Chemistry, Physical; Physics, Atomic, Molecular & ChemicalMultiple languages
Refereed: Yes
URI: http://kups.ub.uni-koeln.de/id/eprint/17407

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