Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Microscopic Properties of the Heavy-Fermion Superconductor PuCoIn$_5$
  Explored by Nuclear Quadrupole Resonance   We report $^{115}$In nuclear quadrupolar resonance (NQR) measurements on the
heavy-fermion superconductor PuCoIn$_5$, in the temperature range $0.29{\rm
K}\leq T\leq 75{\rm K}$. The NQR parameters for the two crystallographically
inequivalent In sites are determined, and their temperature dependence is
investigated. A linear shift of the quadrupolar frequency with lowering
temperature below the critical value $T_c$ is revealed, in agreement with the
prediction for composite pairing. The nuclear spin-lattice relaxation rate
$T_1^{-1}(T)$ clearly signals a superconducting (SC) phase transition at
$T_c\simeq 2.3$K, with strong spin fluctuations, mostly in-plane, dominating
the relaxation process in the normal state near to $T_c$. Analysis of the
$T_1^{-1}$ data in the SC state suggests that PuCoIn$_5$ is a strong-coupling
$d$-wave superconductor.

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The categories of this paper are: funct-an
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The categories of this paper are: patt-sol
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The categories of this paper are: hep-th
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The categories of this paper are: astro-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: supr-con
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The categories of this paper are: cs
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The categories of this paper are: comp-gas
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The categories of this paper are: eess
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: ao-sci
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The categories of this paper are: hep-ex
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The categories of this paper are: alg-geom