Physics – Condensed Matter – Superconductivity
Scientific paper
2008-03-06
Chin.Phys.Lett. 25, 2221-2224 (2008)
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures,Corrected typos
Scientific paper
We report the specific heat measurements on the newly discovered Fe-based layered superconductor LaO_0.9F_{0.1-delta}FeAs with the onset transition temperature T_c \approx 28 K. A nonlinear magnetic field dependence of the electronic specific heat coefficient gamma(H) has been found in the low temperature limit, which is consistent with the prediction for a nodal superconductor. The maximum gap value Delta_0 \approx 3.4$\pm$0.5 meV was derived by analyzing gamma(H) based on the d-wave model. We also detected the electronic specific heat difference between 9 T and 0 T in wide temperature region, a specific heat anomaly can be clearly observed near T_c. The Debye temperature of our sample was determined to be about 315.7 K. Our results suggest an unconventional mechanism for this new superconductor.
Fang Lei
Mu Gang
Ren Cong
Shan Lei
Wen Hai-hu
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