Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ^{63,65}Cu NMR and NQR evidence for an unusual spin dynamics in PrCu_2
  below 100 K   We report the results of a $^{63,65}$Cu NMR/NQR study probing the
intermetallic compound PrCu$_2$. The previously claimed onset of magnetic order
at 65 K, indicated in a $\mu$SR study, is not confirmed. Based on our data we
discuss different possible reasons for this apparent discrepancy, including a
non negligible influence of the implanted muons on their environment. Competing
dipolar and quadrupolar interactions lead to unusual features of the
magnetic-ion/conduction-electron system, different from those of common
intermetallics exhibiting structural or magnetic instabilities.

31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
32
The categories of this paper are: atom-ph