Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Understanding Hydrogen Rich Superconductors: Importance of Effective
  Mass and Dirty Limit   A class of hydrogen-rich (H-rich) systems, consistent with Type II
superconductivity, are known to have very high superconducting transition
temperatures Tc and upper critical magnetic field Bc2 values (up to 288 K and
222 T respectively). By looking at all the experimental H-rich superconductors
reported to date most are in the dirty limit, with only the highest Tc values
being in the crossover to the clean regime. In this framework, there is a clear
understanding of some previous unexplained behaviors: (1) A maximum in Bc2 as a
function of Tc; (2) a clear change in slope in Tc as a function of pressure in
CSH; (3) in zero magnetic field the width of the superconducting transition
decreasing with increasing Tc; and (4) in applied magnetic field the slope of
the superconducting width versus field decreasing with increasing Tc.
Ginzburg-Landau-Abrikosov-Gorkov (GLAG) theory is used to explain all four of
these effects within a framework where increasing Tc is related to increases in
both the electron effective mass and scattering length.

12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
26
The categories of this paper are: bayes-an
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics