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Polycrystalline samples with a nominal composition of NdFe 1– x  Rh  x   AsO (0 ≤  x  ≤ 0.25) were synthesized using a solid state reaction method. Bulk superconductivity with a maximum  T  C  = 13 K is observed in the  x  = 0.1 sample. A temperature–composition phase diagram is established for the NdFe 1– x  Rh  x   AsO system based on the electrical resistivity and magnetization measurements. A first‐order‐like transition from an antiferromagnetic state to the superconducting state at a critical Rh‐doping point  x  C  ≈ 0.045 is observed in the present phase diagram. The value for the upper critical field  μ  0  H  c2 (0) is estimated to be about 26 T for the  x  = 0.10 sample by using the Werthamer–Helfand–Hohenberg theory. (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

Phase diagram of the NdFe 1– x Rh x AsO superconductor