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@ARTICLE{Xu:818259,
author = {Xu, Chencheng and Bäumer, Christoph and Heinen, Ronja
Anika and Hoffmann-Eifert, Susanne and Gunkel, Felix and
Dittmann, Regina},
title = {{D}isentanglement of growth dynamic and thermodynamic
effects in {L}a{A}l{O}$_{3}$/{S}r{T}i{O}$_{3}$
heterostructures},
journal = {Scientific reports},
volume = {6},
issn = {2045-2322},
address = {London},
publisher = {Nature Publishing Group},
reportid = {FZJ-2016-04733},
pages = {22410},
year = {2016},
abstract = {The influence of non-equilibrium and equilibrium processes
during growth of LaAlO3/SrTiO3 (LAO/STO) heterostructures is
analyzed. We investigate the electronic properties of
LAO/STO heterostructures obtained at constant growth
conditions after annealing in different oxygen atmospheres
within the typical growth window (1 × 10−4
mbar –1 × 10−2 mbar). The variation of annealing
conditions is found to cause a similar change of electronic
properties as observed for samples grown in different oxygen
pressure. The results indicate that equilibrium defect
formation is the dominant process for establishing the
properties of the two-dimensional electron gas (2DEG), while
growth dynamics play a minor role in the typical LAO/STO
growth regime. Furthermore, the effects of non-equilibrium
processes occurring during growth are investigated in detail
by quenching just-grown LAO/STO heterostructures directly
after growth. We show that during growth the sample is
pushed into a non-equilibrium state. After growth, the
sample then relaxes towards equilibrium, while the
relaxation rate strongly depends on the ambient pressure.
The observed relaxation behavior is mainly associated with a
reoxidation of the STO bulk, while the 2DEG is formed
immediately after the growth.},
cin = {PGI-7},
ddc = {000},
cid = {I:(DE-Juel1)PGI-7-20110106},
pnm = {521 - Controlling Electron Charge-Based Phenomena
(POF3-521)},
pid = {G:(DE-HGF)POF3-521},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000372694600001},
doi = {10.1038/srep22410},
url = {https://juser.fz-juelich.de/record/818259},
}