A flurry of reports in the current edition of Physical Review Letters(Bustarret et al., Blase et al., Boeri et al., Roesch et al) build on the discovery earlier this year that boron doped diamond is a superconductor. I’m surprised we haven’t heard more of this from MNT enthusiasts, who are usually fascinated by anything to do with diamond. The transition temperature, admittedly, is a very chilly 4 Kelvin.
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I think that is because the MNT enthusiasts expect to use carbon in its graphite form for electrical connections.
As a side note I am still amazed that the two form of pure carbon (diamond and graphite) can have such radically different (and complementary) properties.