Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ferromagnetic insulating state in manganites:55Mn study   55Mn NMR was used to study the ferromagnetic insulating state in four
different manganites. In all cases the coexistence of two types of regions
possessing different NMR spectra and nuclear spin dynamics was found. In the
ferromagnetic insulating clusters the hopping frequency fhop of the electron
holes is slower comparing to the NMR frequency fres and two lines ascribed to
3+ and 4+ valence states of Mn are observed. The relaxation rate increases
rapidly with the increasing temperature, so that these spectra can no longer be
observed for temperatures higher than approx 60 K. In ferromagnetic metallic
clusters fres < fhop and the motionally narrowed spectrum is observed in a
broad temperature interval, as the relaxation remains only moderately fast.

26
The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat
21
The categories of this paper are: adap-org
11
The categories of this paper are: hep-lat
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
32
The categories of this paper are: atom-ph
2
The categories of this paper are: math
3
The categories of this paper are: physics
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs