Abstract:Here we report a new quaternary iron-arsenide superconductor Nd[O 1-x F x ]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[O 1-x F x ]FeAs that superconducts above 50 K.
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