New insights into correlated materials in the time domain: combining far-infrared excitation with x-ray probes at cryogenic temperatures (Conference Presentation)

Roman Mankowsky; Mathias Sander; Serhane Zerdane; Jakub Vonka; Marek Bartkowiak; Yunpei Deng; Rafael Winkler; Flavio Giorgianni; Guy Matmon; Simon Gerber; Paul Beaud; Henrik T. Lemke

doi:10.1117/12.2669054

9 June 2023 New insights into correlated materials in the time domain: combining far-infrared excitation with x-ray probes at cryogenic temperatures (Conference Presentation)

Roman Mankowsky, Mathias Sander, Serhane Zerdane, Jakub Vonka, Marek Bartkowiak, Yunpei Deng, Rafael Winkler, Flavio Giorgianni, Guy Matmon, Simon Gerber, Paul Beaud, Henrik T. Lemke

Author Affiliations +

Proceedings Volume PC12581, X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VI; PC125810G (2023) https://doi.org/10.1117/12.2669054
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

Modern techniques for the investigation of correlated materials in the time domain combine selective excitation in the THz frequency range with selective probing of coupled structural, electronic and magnetic degrees of freedom using x-ray scattering techniques. Cryogenic sample temperatures are commonly required to prevent thermal occupation of the low energy modes and to access relevant material ground states. Here, we present a chamber optimized for high-field THz excitation and (resonant) x-ray diffraction at sample temperatures between 5 and 500 K. Directly connected to the beamline vacuum and featuring both a Beryllium window and an in-vacuum detector, the chamber covers the full (2–12.7) keV energy range of the femtosecond x-ray pulses available at the Bernina endstation of the SwissFEL free electron laser. Successful commissioning experiments made use of the energy tunability to selectively track the dynamics of the structural, magnetic and orbital order of Ca2RuO4 and Tb2Ti2O7 at the Ru (2.96 keV) and Tb (7.55 keV) L-edges, respectively. The chamber has been employed extensively in user operation since 2021, during which THz field amplitudes up to 1.12 MV cm−1 peak field were demonstrated and used to excite the samples at temperatures as low as 5 K. New developments, which allow the chamber to be used in optical pump, x-ray probe experiments in grazing incidenc geometry down to 5 K sample temperature have been commissioned recently. For more details, see https://iopscience.iop.org/article/10.1088/1361-648X/ac08b5

Conference Presentation

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Roman Mankowsky, Mathias Sander, Serhane Zerdane, Jakub Vonka, Marek Bartkowiak, Yunpei Deng, Rafael Winkler, Flavio Giorgianni, Guy Matmon, Simon Gerber, Paul Beaud, and Henrik T. Lemke "New insights into correlated materials in the time domain: combining far-infrared excitation with x-ray probes at cryogenic temperatures (Conference Presentation)", Proc. SPIE PC12581, X-Ray Free-Electron Lasers: Advances in Source Development and Instrumentation VI, PC125810G (9 June 2023); https://doi.org/10.1117/12.2669054

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KEYWORDS

X-rays

Cryogenics

Vacuum chambers

Terahertz radiation

Magnetism

X-ray diffraction

X-ray optics

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