Physics – Condensed Matter – Superconductivity
Scientific paper
2008-08-21
Phys. Rev. B 79, 174501 (2009)
Physics
Condensed Matter
Superconductivity
5 pages, 5 figures
Scientific paper
10.1103/PhysRevB.79.174501
We report the specific heat (SH) measurements on single crystals of hole doped $FeAs$-based superconductor $Ba_{0.6}K_{0.4}Fe_2As_2$. It is found that the electronic SH coefficient $\gamma_e(T)$ is not temperature dependent and increases almost linearly with the magnetic field in low temperature region. These point to a fully gapped superconducting state. Surprisingly the sharp SH anomaly $\Delta C/T|_{T_c}$ reaches a value of 98 $mJ/mol K^2$ suggesting a very high normal state quasiparticle density of states ($\gamma_n \approx 63 mJ/mol K^2$). A detailed analysis reveals that the $\gamma_e(T)$ cannot be fitted with a single gap of s-wave symmetry due to the presence of a hump in the middle temperature region. However, our data indicate that the dominant part of the superconducting condensate is induced by an s-wave gap with the magnitude of about 6 meV.
Luo Hui-qian
Mu Gang
Ren Cong
Shan Lei
Wang Zhaosheng
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