Abstract
Here we report a new quaternary iron-arsenide superconductor Nd[O1−x Fx ]FeAs , with the onset resistivity transition at 51.9 K and Meissner transition at 51 K. This compound has the same crystal structure as LaOFeAs, and becomes the second superconductor after Pr[O1−x Fx]FeAs that superconducts above 50 K.
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