Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction
- We report on synchrotron-based high-repetition rate ultrafast x-ray diffraction (UXRD) experiments monitoring the transport of heat from an epitaxial La(0.7)Sr(0.3)MnO(3)/SrTiO(3) superlattice (SL) into the substrate on timescales from 100 ps to 4 mu s. Transient thermal lattice expansion was determined with an accuracy of 10(-7), corresponding to a sensitivity to temperature changes down to 0.01 K. We follow the heat flow within the SL and into the substrate after the impulsive laser heating leads to a small temperature rise of Delta T = 6 K. The transient lattice temperature can be simulated very well using the bulk heat conductivities. This contradicts the interpretation of previous UXRD measurements, which predicted a long-lasting expansion of SrRuO(3) for more than 200 ps. The disagreement could be resolved by assuming that the heat conductivity changes in the first hundred picoseconds.
Verfasserangaben: | Roman Shayduk, Hengameh Navirian, Wolfram LeitenbergerGND, Jevgenij Goldshteyn, Ionela Vrejoiu, Martin Weinelt, Peter Gaal, Marc HerzogORCiDGND, Clemens von Korff Schmising, Matias BargheerORCiDGND |
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DOI: | https://doi.org/10.1088/1367-2630/13/9/093032 |
ISSN: | 1367-2630 |
Titel des übergeordneten Werks (Englisch): | New journal of physics : the open-access journal for physics |
Verlag: | IOP Publ. Ltd. |
Verlagsort: | Bristol |
Publikationstyp: | Wissenschaftlicher Artikel |
Sprache: | Englisch |
Jahr der Erstveröffentlichung: | 2011 |
Erscheinungsjahr: | 2011 |
Datum der Freischaltung: | 26.03.2017 |
Band: | 13 |
Ausgabe: | 11 |
Seitenanzahl: | 11 |
Fördernde Institution: | DFG [BA 2281/3-1, SFB 762]; Swedish Research Council (VR) |
Organisationseinheiten: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer Review: | Referiert |
Publikationsweg: | Open Access |