In almost all superconductors discovered to date, Cooper pairs—the quasiparticles that carry the supercurrent—are formed from the pairing of two electrons with opposite spins. But theory predicts that, under some delicate and exacting conditions, Cooper pairs can also form from electrons with parallel spins. Now a team at Okayama University in Japan led by Guo-qing Zheng has made the first definitive measurement of such “spin-triplet” superconductivity [1].
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