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

Shayduk, Roman; Navirian, Hengameh; Leitenberger, Wolfram; Goldshteyn, Jevgenij; Vrejoiu, Ionela; Weinelt, Martin; Gaal, Peter; Herzog, Marc; von Korff Schmising, Clemens LU and Bargheer, Matias (2011) In New Journal of Physics 13.
Abstract
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 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... (More)
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 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 SrRuO3 for more than 200 ps. The disagreement could be resolved by assuming that the heat conductivity changes in the first hundred picoseconds. (Less)
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author
organization
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type
Contribution to journal
publication status
published
subject
in
New Journal of Physics
volume
13
publisher
IOP Publishing Ltd.
external identifiers
  • wos:000296649400003
  • scopus:80053417297
ISSN
1367-2630
DOI
10.1088/1367-2630/13/9/093032
language
English
LU publication?
yes
id
f44ac29d-37a2-4306-9edf-a8d8990b32a6 (old id 2254156)
date added to LUP
2011-12-20 12:16:14
date last changed
2017-09-10 04:14:24
@article{f44ac29d-37a2-4306-9edf-a8d8990b32a6,
  abstract     = {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 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 SrRuO3 for more than 200 ps. The disagreement could be resolved by assuming that the heat conductivity changes in the first hundred picoseconds.},
  articleno    = {093032},
  author       = {Shayduk, Roman and Navirian, Hengameh and Leitenberger, Wolfram and Goldshteyn, Jevgenij and Vrejoiu, Ionela and Weinelt, Martin and Gaal, Peter and Herzog, Marc and von Korff Schmising, Clemens and Bargheer, Matias},
  issn         = {1367-2630},
  language     = {eng},
  publisher    = {IOP Publishing Ltd.},
  series       = {New Journal of Physics},
  title        = {Nanoscale heat transport studied by high-resolution time-resolved x-ray diffraction},
  url          = {http://dx.doi.org/10.1088/1367-2630/13/9/093032},
  volume       = {13},
  year         = {2011},
}