Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic field-induced quasiparticle excitation in Nb3Sn: Evidence for
  anisotropic s-wave pairing   The response of vortex state to the magnetic field in Nb3Sn is probed using
muon spin rotation and small-angle neutron scattering. A transformation of
vortex structure between hexagonal and squared lattice is observed over a
relatively low field range of 2-3 Tesla. The gradual increase of the magnetic
penetration depth with increasing field provides microscopic evidence for
anisotropic (or multi-gapped) s-wave pairing suggested by the Raman scattering
experiment. This result renders need for careful examination on the difference
of electronic properties between Nb3Sn and V3Si.

16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
21
The categories of this paper are: adap-org
33
The categories of this paper are: plasm-ph
11
The categories of this paper are: hep-lat
17
The categories of this paper are: q-fin
18
The categories of this paper are: econ
9
The categories of this paper are: nlin