Chin. Phys. Lett.  2008, Vol. 25 Issue (6): 2221-2224    DOI:
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Nodal Gap in Fe-Based Layered Superconductor LaO0.9F0.1-δFeAs Probed by Specific Heat Measurements
MU Gang;ZHU Xi-Yu;FANG Lei;SHAN Lei;REN Cong;WEN Hai-Hu
National Laboratory for Superconductivity, Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences, PO Box 603, Beijing 100190
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Abstract We report the specific heat measurements on the newly discovered Fe-based layered LaO0.9F 0.1-δFeAs superconductor with the onset transition temperature Tc≈28K. A nonlinear magnetic field dependence of the electronic specific heat coefficient γ(H) has been found in the low temperature limit, which is consistent with the prediction for a nodal superconductor. The maximum gap value ∆0≈3.4 ±0.5meV is derived by analysing γ(H) based on the d-wave model. We also detected the electronic specific heat difference between 9T and 0T in a wide temperature range, a specific heat anomaly can be clearly observed near Tc. The Debye temperature of our sample is determined to be about 315.7K. Our results suggest an unconventional mechanism for this new superconductor.
Keywords: 74.20.Rp      74.25.Bt      65.40.Ba      74.70.Dd     
Received: 30 April 2008      Published: 31 May 2008
PACS:  74.20.Rp (Pairing symmetries (other than s-wave))  
  74.25.Bt (Thermodynamic properties)  
  65.40.Ba (Heat capacity)  
  74.70.Dd (Ternary, quaternary, and multinary compounds)  
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MU Gang, ZHU Xi-Yu, FANG Lei et al  2008 Chin. Phys. Lett. 25 2221-2224
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MU Gang
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