Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Temperature evolution of superparamagnetic clusters in single-crystal
  La0.85Sr0.15CoO3 from nonlinear magnetic ac response and neutron
  depolarization   The representative measurements of the second harmonic in ac magnetization
complemented by neutron depolarization have been performed for single-crystal
La0.85Sr0.15CoO3 in the temperature range 97 K < T < 230 K, where occurrence of
a small fraction (~ 0.001) of nanoscale ferromagnetic clusters (FMC) has been
found. Magnetic, geometrical and dynamical parameters of the FMC system have
been evaluated in the temperature range T < 140 K, where superparamagnetic
regime installs, by means of the formalism involving the Fokker-Planck equation
(FPE). With lowering the temperature, the amount of clusters fraction, the
cluster size and magnetic moment along with its diffusion relaxation time
strongly increase, each in its own temperature interval. Below 130 K, FMC
contribute essentially to the total linear magnetic susceptibility. The damping
factor of the order 0.1 proves the importance of precession in thermal
relaxation of the cluster magnetic moment. The FMC are a precursor of
long-range ferromagnetic correlations seen below 100 K with neutron-scattering
techniques. The employed technique supplemented with FPE-based data-treatment
formalism is a novel method for studying superparamagnetic systems.

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The categories of this paper are: nucl-ex
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The categories of this paper are: eess
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The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
34
The categories of this paper are: chem-ph
0
The categories of this paper are: hep-ph
37
The categories of this paper are: supr-con
12
The categories of this paper are: nucl-th
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The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: quant-ph
25
The categories of this paper are: patt-sol
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The categories of this paper are: math
6
The categories of this paper are: astro-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: hep-ex