Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Critical current density and magnetic phase diagram of BaFe1.29Ru0.71As2
  Single Crystals   The critical current density has been measured on single crystals of Ru
substituted BaFe2As2 superconductor at several temperatures and in fields up to
16 T. The magnetisation versus field isotherms reveal the occurrence of a clear
second magnetisation peak (SMP) also known as fish-tail effect for both H
parallel and perpendicular to c-axis of the crystal. The in-field resistance
and magnetisation data are used to put forth a vortex phase diagram. The nature
of the vortices have been determined from scaling behaviour of the pinning
force density extracted from the Jc-H isotherms. The scaled JC versus reduced
temperature behaviour seems to fit to a power law that indicates unambiguously
that pinning in this system arises due to the spatial variation in the mean
free path, viz. delta-l pinning.

23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
19
The categories of this paper are: eess
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
2
The categories of this paper are: math
34
The categories of this paper are: chem-ph
15
The categories of this paper are: nucl-ex
37
The categories of this paper are: supr-con
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga