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.
Author details: | 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 |
Title of parent work (English): | New journal of physics : the open-access journal for physics |
Publisher: | IOP Publ. Ltd. |
Place of publishing: | Bristol |
Publication type: | Article |
Language: | English |
Year of first publication: | 2011 |
Publication year: | 2011 |
Release date: | 2017/03/26 |
Volume: | 13 |
Issue: | 11 |
Number of pages: | 11 |
Funding institution: | DFG [BA 2281/3-1, SFB 762]; Swedish Research Council (VR) |
Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie |
Peer review: | Referiert |
Publishing method: | Open Access |