Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction

Details Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction

Sep 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13i3032s&link_type=abstract

New Journal of Physics, Volume 13, Issue 9, pp. 093032 (2011).

Physics

Scientific paper

We report on synchrotron-based high-repetition rate ultrafast x-ray diffraction (UXRD) experiments monitoring the transport of heat from an epitaxial La0.7Sr0.3MnO3/SrTiO3 superlattice (SL) into the substrate on timescales from 100 ps to 4 μs. 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 ΔT = 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 SrRuO3 for more than 200 ps. The disagreement could be resolved by assuming that the heat conductivity changes in the first hundred picoseconds.

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