Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Phenomenological Model of the Nonlinear Microwave Response of a
  Superconductor Containing Weak Links   A phenomenological model is proposed which describes the effect of both dc
and rf magnetic fields, $H$, on the microwave surface impedance, Z_s=R_s+jX_s,
of a superconductor containing weak link. Two cases are considered; a weak link
between two grains, shunted by another grain, and a non-shunted weak link. In
both cases the dependences of R_s and X_s on applied field H were found to be
anomalous. Under certain conditions, the values of Z_s(H) can fall below the
zero-field values. Comparison with experiment is performed, and very good
qualitative and (in some cases) quantitative agreement is found.

13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
30
The categories of this paper are: q-alg
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
8
The categories of this paper are: hep-ex
26
The categories of this paper are: bayes-an
19
The categories of this paper are: eess
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
23
The categories of this paper are: solv-int