Analysis of the temperature- and fluence-dependent magnetic stress in laser-excited SrRuO3
- We use ultrafast x-ray diffraction to investigate the effect of expansive phononic and contractive magnetic stress driving the picosecond strain response of a metallic perovskite SrRuO3 thin film upon femtosecond laser excitation. We exemplify how the anisotropic bulk equilibrium thermal expansion can be used to predict the response of the thin film to ultrafast deposition of energy. It is key to consider that the laterally homogeneous laser excitation changes the strain response compared to the near-equilibrium thermal expansion because the balanced in-plane stresses suppress the Poisson stress on the picosecond timescale. We find a very large negative Grüneisen constant describing the large contractive stress imposed by a small amount of energy in the spin system. The temperature and fluence dependence of the strain response for a double-pulse excitation scheme demonstrates the saturation of the magnetic stress in the high-fluence regime.
Author details: | M. Mattern, Jan-Etienne PudellORCiDGND, G. Laskin, A. von ReppertORCiD, Matias BargheerORCiDGND |
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DOI: | https://doi.org/10.1063/4.0000072 |
ISSN: | 2329-7778 |
Title of parent work (English): | Structural Dynamics |
Publication type: | Article |
Language: | English |
Date of first publication: | 2020/12/15 |
Publication year: | 2021 |
Release date: | 2021/08/19 |
Tag: | Bragg peak; Lasers; Lattice dynamics; Magnetism; Perovskites; Phonons; Thermal effects; Thermodynamic properties; Thin films; Ultrafast X-ray diffraction |
Number of pages: | 9 |
Funding institution: | Universität Potsdam |
Funding number: | PA 2021_022 |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
DDC classification: | 5 Naturwissenschaften und Mathematik / 50 Naturwissenschaften / 500 Naturwissenschaften und Mathematik |
5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik | |
Peer review: | Referiert |
Grantor: | Publikationsfonds der Universität Potsdam |
Publishing method: | Open Access / Gold Open-Access |
License (German): | CC-BY - Namensnennung 4.0 International |
External remark: | Bibliographieeintrag der Originalveröffentlichung/Quelle |