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We measured the initial M-H curves for a sample of the newly discoveredsuperconductor NdFeAsO0.82Fe0.18, which had a critical temperature, Tc, of 51K, and was fabricated at the high pressure of 6 GPa. The lower critical field,Hc1, was extracted from the deviation point of the Meissner linearity in theM-H curves, which show linear temperature dependence in the low temperatureregion down to 5 K. The Hc1(T) indicates no s-wave superconductivity, butrather an unconventional superconductivity with a nodal gap structure.Furthermore, the linearity of Hc1 at low temperature does not hold at hightemperature, but shows other characteristics, indicating that thissuperconductor might have multi-gap features. Based on the low temperaturenodal gap structure, we estimate that the maximum gap magnitude delta 0 =(1.6+- 0.2) kBTc.

Unconventional superconductivity of NdFeAsO0.82F0.18 indicated by the low temperature dependence of the lower critical field Hc1