Figure 10: Nature Communications

Fig. 10

From: Discovery of superconductivity in quasicrystal

Fig. 10

Superconducting upper critical field. The superconducting upper critical fields H c 2 of the QC, the 2/1AC, the 1/1AC_F are plotted in the form of h=- H c 2 ( T c d H c 2 d T T = T c ) vs t=T T c . The solid curve denotes the Werthamer–Helfand–Hohenberg theory in the dirty limit. The inset shows H c 2 ( T ) of the same samples as in the main frame. Note that the upper critical field in the limit of zero temperature of the 1/1AC_F ( H c 2 ( 0 ) 500 Oe) substantially exceeds that of metal Al (~100 Oe), excluding the possibility that the superconductivity would arise from Al-derived impurity phase