Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence of Current Stabilization after a Long-Time Decay in High-Tc
  Superconductors   In this work, we studied the flux creep phenomenon over a long period [viz.
about 1.5 10E7 s (i.e. for 6 months)] at liquid nitrogen temperature. For this
purpose, four high-Tc ring-shaped samples were field-cooled (one sample) or
ferromagnetic field-cooled (three samples) in order to induce a persistent
current. The resulting current decay was measured using a Hall probe system and
the results obtained revealed low relaxation rates in the ferromagnetic
field-cooled samples. Also, the experimental data were found to depart from the
prediction of the classical models after a long enough time. The slope of the
logarithmic current decay plot exhibited an oscillatory phenomenon at ca. 2
10E5 s (about 55 hours). Oscillations vanished at ca. 4-5 10E6 s (46-55 days),
after which the induced current remained stable throughout the remainder of the
experiencing period.

13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
6
The categories of this paper are: astro-ph