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Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment
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. I...
Autores principales: | , , , , , , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Crystallographic Association
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6158032/ https://www.ncbi.nlm.nih.gov/pubmed/30310825 http://dx.doi.org/10.1063/1.5042847 |
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author | Pontius, N. Beye, M. Trabant, C. Mitzner, R. Sorgenfrei, F. Kachel, T. Wöstmann, M. Roling, S. Zacharias, H. Ivanov, R. Treusch, R. Buchholz, M. Metcalf, P. Schüßler-Langeheine, C. Föhlisch, A. |
author_facet | Pontius, N. Beye, M. Trabant, C. Mitzner, R. Sorgenfrei, F. Kachel, T. Wöstmann, M. Roling, S. Zacharias, H. Ivanov, R. Treusch, R. Buchholz, M. Metcalf, P. Schüßler-Langeheine, C. Föhlisch, A. |
author_sort | Pontius, N. |
collection | PubMed |
description | 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. |
format | Online Article Text |
id | pubmed-6158032 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | American Crystallographic Association |
record_format | MEDLINE/PubMed |
spelling | pubmed-61580322018-10-11 Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment Pontius, N. Beye, M. Trabant, C. Mitzner, R. Sorgenfrei, F. Kachel, T. Wöstmann, M. Roling, S. Zacharias, H. Ivanov, R. Treusch, R. Buchholz, M. Metcalf, P. Schüßler-Langeheine, C. Föhlisch, A. Struct Dyn Articles 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. American Crystallographic Association 2018-09-26 /pmc/articles/PMC6158032/ /pubmed/30310825 http://dx.doi.org/10.1063/1.5042847 Text en © 2018 Author(s). 2329-7778/2018/5(5)/054501/8 All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Articles Pontius, N. Beye, M. Trabant, C. Mitzner, R. Sorgenfrei, F. Kachel, T. Wöstmann, M. Roling, S. Zacharias, H. Ivanov, R. Treusch, R. Buchholz, M. Metcalf, P. Schüßler-Langeheine, C. Föhlisch, A. Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title | Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title_full | Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title_fullStr | Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title_full_unstemmed | Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title_short | Probing the non-equilibrium transient state in magnetite by a jitter-free two-color X-ray pump and X-ray probe experiment |
title_sort | probing the non-equilibrium transient state in magnetite by a jitter-free two-color x-ray pump and x-ray probe experiment |
topic | Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6158032/ https://www.ncbi.nlm.nih.gov/pubmed/30310825 http://dx.doi.org/10.1063/1.5042847 |
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