Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Site-selective $^{63}$Cu NMR study of the vortex cores of
  Tl$_{2}$Ba$_{2}$CuO$_{6+\delta}$   We report site-selective $^{63}$Cu NMR studies of the vortex core states of
an overdoped Tl$_{2}$Ba$_{2}$CuO$_{6+\delta}$ with $T_{c}$ = 85 K. We observed
a relatively high density of low-energy quasi-particle excitations at the
vortex cores in a magnetic field of 7.4847 T along the c axis, in contrast to
YBa$_{2}$Cu$_{3}$O$_{7-\delta}$.

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The categories of this paper are: q-fin
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The categories of this paper are: alg-geom
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The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
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The categories of this paper are: solv-int
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The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: eess
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The categories of this paper are: nucl-th
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The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: stat
1
The categories of this paper are: cs