Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Point-contact spectroscopy in Co-doped CaFe2As2: nodal superconductivity
  and topological Fermi surface transition   We performed point-contact Andreev reflection spectroscopy measurements in
Ca(Fe_{1-x}Co_x)2As2 single crystals with effective x=0.060 +- 0.005. The
spectra of ab-plane contacts show a zero-bias maximum and broad shoulders at
about 5-6 meV. Their fit with the three-dimensional Blonder-Tinkham-Klapwijk
model (making use of a analytical expression for the Fermi surface that mimics
the one calculated from first principles) shows that this compound presents a
large isotropic gap on the quasi-2D electronlike Fermi surface sheets and a
smaller anisotropic (possibly nodal) gap on the 3D holelike Fermi surface
pockets centered at the Z point in the Brillouin zone. These results nicely fit
into the theoretical picture for the appearance of nodal superconductivity in
122 compounds.

10
The categories of this paper are: q-bio
14
The categories of this paper are: math-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
33
The categories of this paper are: plasm-ph
21
The categories of this paper are: adap-org
30
The categories of this paper are: q-alg
2
The categories of this paper are: math
17
The categories of this paper are: q-fin