Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Single crystal structural study of the charge ordered phase of
  Pr0.6Ca0.4MnO3: electronic localization beyond the atomic level   In the R1/2D1/2MnO3 manganites (R: rare earth, D: divalent cation), the
structural phase transition at Tco is commonly interpreted as a concomitant
charge and orbital ordering (CO/OO) process driven by a cooperative Jahn-Teller
effect and Coulomb repulsion forces. Full crystal structure refinement, from a
neutron diffraction experiment below Tco on a Pr0.6Ca0.4MnO3 single crystal,
gives us a model for the displacement of atoms with respect to the high
temperature (HT) phase that invalidates the standard model based on the CO/OO
picture. An alternative picture is that the phase transition and charge
localization at Tco arise from a spatially ordered condensation of
ferromagnetic Mn-Mn pairs, in which Mn atoms keeps an intermediate valence
state.

28
The categories of this paper are: alg-geom
26
The categories of this paper are: bayes-an
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th