Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Raman scattering in superconducting NdO1-xFxBiS2 crystals   The recently discovered layered BiS2-based superconductors have attracted a
great deal of interest due to their structural similarity to cuprate and
iron-pnictide superconductors. We have performed Raman scattering measurements
on two superconducting crystals NdO0.5F0.5BiS2 (Tc = 4.5 K) and NdO0.7F0.3BiS2
(Tc = 4.8 K). The observed Raman phonon modes are assigned with the aid of
first-principles calculations. The asymmetrical phonon mode around 118 cm-1
reveals a small electron-phonon (e-ph) coupling constant 0.16, which is
insufficient to generate superconductivity at ~ 4.5 K. In the Raman spectra
there exists a clear temperature-dependent hump around 100 cm-1, which can be
well understood in term of inter-band vertical transitions around Fermi
surface. The transitions get boosted when the particular rectangular-like Fermi
surface meets band splitting caused by spin-orbit coupling. It enables a unique
and quantitative insight into the band splitting.

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The categories of this paper are: econ
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: chem-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
32
The categories of this paper are: atom-ph
12
The categories of this paper are: nucl-th
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The categories of this paper are: solv-int
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: math-ph