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The only element that can become a superfluid is Helium (He-3 and He-4) since it does not solidify not matter how cold it gets, hence it can reach the superfluid transition temperature whilst still a liquid.

Can we make an artificial mixture of elements such that this new material could also reach the superfluid transition temperature while still a liquid? In the same way as we dope semiconductors, can we 'dope' a fluid that would not normally not become a superfluid for it to exhibit such a phase transition?

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  • $\begingroup$ It seems that neutron matter can be a superfluid, too. Technically neutrons can be considered isotopes with charge zero, so neutron matter would actually lead the periodic table before hydrogen. There are also suggestions that metallic hydrogen may have a superfluid phase next to its superconducting phase. But I am getting pedantic, am I not? :-) $\endgroup$ – CuriousOne Oct 31 '15 at 21:30
  • $\begingroup$ "seems"? Theoretically or experimentally? What about other, heavier, elements? $\endgroup$ – SuperCiocia Nov 6 '15 at 18:05

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