Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Superconductivity in Uranium Compounds   On the basis of microscopic theory it is demonstrated how the coupling
between the electrons by means of magnetization fluctuations in ferromagnetic
metal with orthorhombic symmetry gives rise equal spin pairing superconducting
state with general form of the order parameter dictated by symmetry. The strong
upturn of the upper critical field along $b$-direction above 5 Tesla in UCoGe
is explained by the increase of pairing interaction caused by the suppression
of the Curie temperature by magnetic field parallel to b-axis. It is proposed
that similar phenomenon at much higher field must take place also for the field
directed along the magnetically hardest a-direction.

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The categories of this paper are: alg-geom
11
The categories of this paper are: hep-lat
15
The categories of this paper are: nucl-ex
14
The categories of this paper are: math-ph
16
The categories of this paper are: stat
17
The categories of this paper are: q-fin
19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
31
The categories of this paper are: ao-sci
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
33
The categories of this paper are: plasm-ph
23
The categories of this paper are: solv-int
5
The categories of this paper are: gr-qc