Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Thickness and temperature dependence of the atomic-scale structure of
  SrRuO$_3$ thin films   Due to the strong lattice-property relationships which exist in complex oxide
epitaxial layers, their electronic and magnetic properties can be modulated by
structural distortions induced at the atomic scale. The modification and
control can be affected at coherent heterointerfaces by epitaxial strain
imposed by the substrate or by structural modifications to accommodate the
film-substrate symmetry mismatch. Often these act in conjunction with a strong
dependence on the layer thickness, especially for ultrathin layers. Moreover,
as a result of these effects, the temperature dependence of the structure may
deviate largely from that of the bulk. The temperature-dependent structure of 3
to 44 unit cell thick ferromagnetic SrRuO$_3$ films grown on Nb-doped SrTiO$_3$
substrates are investigated using a combination of high-resolution synchrotron
X-ray diffraction and high-resolution electron microscopy. This aims to shed
light on the intriguing magnetic and magnetotransport properties of epitaxial
SRO layers, subjected to extensive investigations lately. The oxygen octahedral
tilts and rotations are found to be strongly dependent on the temperature, the
film thickness, and the distance away from the film-substrate interface. As a
striking manifestation of the coupling between magnetic order and lattice
structure, the Invar effect is observed below the ferromagnetic transition
temperature in epitaxial layers as thin as 8 unit cells, similar to bulk
ferromagnetic SrRuO$_3$.

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The categories of this paper are: atom-ph
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
30
The categories of this paper are: q-alg
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math