Infinite Conductivity
Hg
0.8
Tl
0.2
Ba
2
Ca
2
Cu
3
O
8.33
HgBa
2
Ca
2
Cu
3
O
8
HgBa
2
Ca
3
Cu
4
O
10+
HgBa
2
Ca
1-x
Sr
x
Cu
2
O
6+
HgBa
2
CuO
4
+
138 K
*
(
record-holder
)
133-135 K
125-126 K
123-125 K
94-98 K
Leiden 1911- Kamerligh Onnes