Superfluid Helium-3 Has a Metallic Partner

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Science  12 Nov 2004:
Vol. 306, Issue 5699, pp. 1142-1143
DOI: 10.1126/science.1106019

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Although there are very many metallic superconductors, it has not been possible to show that any of them is a direct analog of the superfluid state found in the fermionic isotope of helium (He). In his Perspective, Rice highlights the report by Nelson et al. , who show that such an analog exists. The authors performed a special quantum interference experiment to establish the quantum mechanical state of the electron pairs in the superconducting phase of strontium ruthenate. They confirm that it is the long-sought analog of superfluidHe.