Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phenomenological two-gap model for the specific heat of MgB_2   We show that the specific heat of the superconductor MgB_2 (MgB2) in zero
field, for which significant non-BCS features have been reported, can be
fitted, essentially within experimental error, over the entire range of
temperature to T_c by a phenomenological two-gap model. The resulting gap
parameters agree with previous determinations from band-structure calculations,
and from various spectroscopic experiments. The determination from specific
heat, a bulk property, shows that the presence of two superconducting gaps in
MgB_2 is a volume effect.

15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
2
The categories of this paper are: math
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
3
The categories of this paper are: physics
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas
1
The categories of this paper are: cs
6
The categories of this paper are: astro-ph
26
The categories of this paper are: bayes-an