Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ARPES and optical renormalizations: phonons or spin fluctuations   Improved resolution in both, energy and momentum in ARPES-data has lead to
the establishment of a definite energy scale in the dressed quasiparticle
dispersion relations. The observed structure around 80 meV has been taken as
evidence for coupling to phonons and has re-focused the debate about the
mechanism of superconductivity in the cuprates. Here we address the relative
merits of phonon as opposed to spin fluctuation mechanisms. Both possibilities
are consistent with ARPES. On the other hand, when considerations are extended
to infrared optical data, a spin fluctuation mechanism provides a more natural
interpretation of the combined sets of data in Bi_2Sr_2CaCu_2O_{8+\delta}
(Bi2212).

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The categories of this paper are: adap-org
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The categories of this paper are: hep-ex
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas
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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: econ
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The categories of this paper are: solv-int
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The categories of this paper are: stat
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-fin
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-th
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The categories of this paper are: gr-qc