Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Slow Vortex Creep Induced by Strong Grain Boundary Pinning in Advanced
  Ba122 Superconducting Tapes   We report the temperature, magnetic field and time dependences of
magnetization in advanced Ba122 superconducting tapes. The sample exhibits a
peculiar vortex creep behavior. Below 10 K, the normalized magnetization
relaxation rate S=dln(-M)/dln(t) shows a temperature insensitive plateau with a
value comparable to that of the low temperature superconductors, which can be
explained within the framework of the collective creep theory. It then enters
into a second collective creep regime when the temperature increases.
Interestingly, the relaxation rate below 20 K tends to saturate with the
increasing field. However, it changes to a power law dependence on field at a
higher temperature. A vortex phase diagram composed of the collective and the
plastic creep regions is concluded. Benefit from the strong grain boundary
pinning, the advanced Ba122 superconducting tape has promising potential to be
applied not only in liquid helium but also in liquid hydrogen or at the
temperature accessible with cryocoolers.

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The categories of this paper are: quant-ph
1
The categories of this paper are: cs
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The categories of this paper are: eess
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The categories of this paper are: math-ph
9
The categories of this paper are: nlin
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The categories of this paper are: funct-an
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: hep-ex
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: q-bio