  We measure the heat capacity of UBe13 with an unusually low Tc for a
polycrystal. We find an upturn in the upper critical field Hc2(T) below about
Tc/2, much as for higher-Tc samples. Comparing the critical fields in our
sample and in samples with higher Tc's shows that the low-temperature limit of
Hc2 is proportional to Tc(H=0), as expected if the upturn comes from an FFLO
phase and strong coupling.
