Physics – Condensed Matter – Superconductivity
Scientific paper
2007-01-18
Physics Letters A 359, 696 (2006)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1016/j.physleta.2006.07.010
Using a highly-sensitive home-made mutual-inductance technique, temperature profiles of the magnetic penetration depth $\lambda (T)$ in the optimally-doped $Sm_{1.85}Ce_{0.15}CuO_4$ thin films have been extracted. The low-temperature behavior of $\lambda (T)$ is found to be best-fitted by linear $\Delta \lambda (T)/\lambda (0)= \ln(2)k_BT/\Delta_0$ and quadratic $\Delta \lambda (T)/\lambda (0)=\Gamma ^{-1/2}\Delta_0^{-3/2}T^2$ laws above and below $T=0.22T_C$, respectively, which clearly indicates the presence of d-wave pairing mechanism dominated by strong paramagnetic scattering at the lowest temperatures. The best fits produce $\Delta_0/k_BT_C=2.07$ and $\Gamma /T_C=0.25(T_C/\Delta_0)^3$ for the estimates of the nodal gap parameter and impurity scattering rate.
Araujo-Moreira Fernando M.
Lanfredi A. J. C.
Sergeenkov Sergei
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