Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Infrared Vortex-State Electrodynamics in Type-II Superconducting Thin
  Films   The vortex-state electrodynamics of s-wave superconductors has been studied
by infrared spectroscopy. Far-infrared transmission and reflection spectra of
superconducting NbTiN and NbN thin films were measured in a magnetic field
perpendicular to the film surface, and the optical conductivity was extracted.
The data show clear reduction of superconducting signature. We consider the
vortex state as a two-component effective medium of normal cores embedded in a
BCS superconductor. The spectral features are well explained by the
Maxwell-Garnett theory. Our analysis supports the presence of
magnetic-field-induced pair-breaking effects in the superconducting component
outside of the vortex cores.

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The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
12
The categories of this paper are: nucl-th
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
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The categories of this paper are: dg-ga
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph