Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Anomaly in the heat capacity of Kondo superconductors   Using numerical renormalization group we study thermodynamic properties of a
magnetic impurity described by the Anderson impurity model in a superconducting
host material described by the BCS Hamiltonian. When the Kondo temperature in
the normal state, T_K, is comparable to the critical temperature of the
superconducting transition, T_c, the magnetic doublet state may become
degenerate with the Kondo singlet state, leading to a ln3 peak in the
temperature dependence of the impurity contribution to the entropy. This
entropy increase translates into an anomalous feature in the heat capacity
which might have already been experimentally observed.

2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
17
The categories of this paper are: q-fin
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
9
The categories of this paper are: nlin
8
The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph