Spin-singlet superconductivity with multiple gaps in PrFeAsO <sub>0.89</sub> F <sub>0.11</sub>
Spin-singlet superconductivity with multiple gaps in PrFeAsO <sub>0.89</sub> F <sub>0.11</sub>
Since the discovery of high transition-temperature (Tc) superconductivity in copper oxides two decades ago, continuous efforts have been devoted to searching 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 …