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The recent discovery of a new class of superconducting oxypnictides with hightransition temperatures may have profound implications for understandingunconventional high-temperature superconductivity. Like the cuprates, theoxypnictides seem to manifest an interleaving of charge donor andsuperconducting layers emerging upon doping of an antiferromagnetic parentsemi-metal. Here we report magneto-transport measurements of three rare earth(Re = La, Nd, Sm) oxypnicide compounds with the transition temperatures nearthe maximum reported to date, in very high DC and pulsed magnetic fields up to45 and 54 T, respectively. Our resistivity, Hall coefficient and criticalmagnetic fields data suggest that these oxypnictide superconductors bridge thegap between MgB$_2$ and YBaCu$_3$O$_{7-x}$ as far as electromagnetic and vortexproperties are concerned.

Comparative High Field Magneto-Transport of Rare Earth Oxypnictides with Maximum Transition Temperatures