  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.
