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We report the specific heat measurements on the newly discovered Fe-basedlayered superconductor LaO_0.9F_{0.1-delta}FeAs with the onset transitiontemperature T_c \approx 28 K. A nonlinear magnetic field dependence of theelectronic specific heat coefficient gamma(H) has been found in the lowtemperature limit, which is consistent with the prediction for a nodalsuperconductor. The maximum gap value Delta_0 \approx 3.4$\pm$0.5 meV wasderived by analyzing gamma(H) based on the d-wave model. We also detected theelectronic specific heat difference between 9 T and 0 T in wide temperatureregion, a specific heat anomaly can be clearly observed near T_c. The Debyetemperature of our sample was determined to be about 315.7 K. Our resultssuggest an unconventional mechanism for this new superconductor.

Nodal Gap in Fe-Based Layered Superconductor LaO_0.9F_{0.1-delta}FeAs Probed by Specific Heat Measurements