Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unconventional Superconductivity in UPd_2Al_3 from Realistic
  Selfconsistent Calculations   Realistic selfconsistent calculations of unconventional superconductivity in
a heavy-fermion material are reported. Our calculations for UPd$_2$Al$_3$ start
from accurate energy band dispersions that are computed within the local
spin-density functional theory and provide Fermi surfaces in agreement with
experiment. Using physically motivated, realistic pairing potentials it is
shown that the superconducting gap has two lines of nodes around the z-axis,
thus exhibiting d-wave symmetry in the $A_{1g}$ representation of the $D_{6h}$
point group. Our results suggest that in a superconductor with gap nodes, the
prevailing gap symmetry is dictated by the constraint that nodes must be as far
as possible from high-density areas.

1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
12
The categories of this paper are: nucl-th
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys