Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: X-Ray Resonant Scattering as a Direct Probe of Orbital Ordering in
  Transition-Metal Oxides   X-ray resonant scattering at the K-edge of transition metal oxides is shown
to measure the orbital order parameter, supposed to accompany magnetic ordering
in some cases. Virtual transitions to the 3d-orbitals are quadrupolar in
general. In cases with no inversion symmetry, such as V$_2$O$_3$, treated in
detail here, a dipole component enhances the resonance. Hence, we argue that
the detailed structure of orbital order in V$_2$O$_3$ is experimentally
accessible.

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The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: supr-con
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The categories of this paper are: math-ph
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
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The categories of this paper are: gr-qc
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The categories of this paper are: math
1
The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th