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The discovery of the new family of oxypnictide superconductors, such asLaFeAsO0.89F0.1, with critical temperature, Tc, over 26 K, has brought newimpetus to the fields of high temperature superconductivity and stronglycorrelated electron systems. These materials showed high upper critical fields,Hc2, which have been estimated to be higher than 55 or 63-65 T inLaO0.9F0.1FeAs with Tc of 26 K, 70 T in PrFeAsO0.85F0.15, and over 100 T inSmO0.85F0.15FeAs with Tc of 46 K. The two gap superconductivity proposed forLaO0.9F0.1FeAs suggests that the Hc2 could be further increased to asignificant extent. This is one of the unique features of the FeAs based newsuperconductors. In this work, we show that the Bc2(48 K) = 13 T and the Bc2(0)value can exceed 230 T in a high pressure fabricated NdO0.82F0.18FeAs bulksample with Tc of 51 K. We also demonstrate that the supercurrent density from1 up to 9 T only drops by a factor of 2-6 for T < 30 K, much weaker than MgB2and high Tc cuprate superconductors. The very high Bc2 already far surpassesthose of high Tc cuprates, MgB2, and classical low temperature superconductors,paving the way to use the new NdO0.82F0.18FeAs superconductors for high-fieldapplications.

Very high critical field and superior Jc-field performance in NdO0.82F0.18FeAs with Tc of 51 K