Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Structural effects on the spin-state transition in epitaxially strained
  LaCoO$_3$ films   Using density functional theory within the LSDA + U method, we investigate
the effect of strain on the spin state and magnetic ordering in perovskite
lanthanum cobaltite, LaCoO3. We show that, while strain-induced changes in
lattice parameters are insufficient to stabilize a non-zero spin state,
additional heteroepitaxial symmetry constraints -- in particular the
suppression of octahedral rotations -- stabilize a ferromagnetic
intermediate-spin state. By comparing with experimental data for the bulk
material, we calculate an upper bound on the Hubbard U value, and describe the
role that the on-site Coulomb interaction plays in determining the spin-state
configuration.

7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
37
The categories of this paper are: supr-con
28
The categories of this paper are: alg-geom
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
35
The categories of this paper are: mtrl-th
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th