Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Nodal multigap superconductivity in the anisotropic iron-based compound
  RbCa2Fe4As4F2   The 12442 compounds are a recently discovered family of iron-based
superconductors, that share several features with the cuprates due to their
strongly anisotropic structure, but are so far poorly understood. Here, we
report on the gap structure and anisotropy of RbCa2(Fe1-xNix)4As4F2 single
crystals, investigated by a combination of directional point-contact
Andreev-reflection spectroscopy and coplanar waveguide resonator measurements.
Two gaps were identified, with clear signatures of d-wave-like nodal structures
which persist upon Ni doping, well described by a two-band d-d state with
symmetry-imposed nodes. A large London penetration depth anisotropy was
revealed, weakly dependent on temperature and fully compatible with the d-d
model.

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The categories of this paper are: q-fin
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
22
The categories of this paper are: chao-dyn
7
The categories of this paper are: hep-th
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
6
The categories of this paper are: astro-ph
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
0
The categories of this paper are: hep-ph
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
8
The categories of this paper are: hep-ex