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Since the discovery of high transition-temperature (Tc) superconductivity incopper oxides two decades ago, continuous efforts have been devoted tosearching for similar phenomenon in other compounds. With the exception of MgB2(Tc =39 K), however, Tc is generally far lower than desired. Recently,breakthrough has been made in a new class of oxypnictide compounds. Followingthe initial discovery of superconductivity in LaO1-x FxFeAs (Tc =26 K), Tconset has been raised to 55 K in ReO1-xFxFeAs (Re: Ce, Pr, Nd, Sm). Meanwhile,unravelling the nature of the energy associated with the formation ofcurrent-carrying pairs (Cooper pairs), referred to as the superconductingenergy gap, is the first and vital step towards understanding why thesuperconductivity occurs at such high temperature and is also important forfinding superconductors with still higher Tc. Here we show that, on the basisof the nuclear magnetic resonance (NMR) measurements in PrO0.89F0.11FeAs (Tc=45 K), the Cooper pair is in the spin-singlet state (two spins areanti-paralleled), with two energy gaps opening below Tc. The results stronglysuggest the existence of nodes (zeros) in the gap. None of superconductorsknown to date has such unique gap features, although copper-oxides and MgB2share part of them.

Spin-singlet superconductivity with multiple gaps in PrO0.89F0.11FeAs