Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap

@article{AbdelHafiez2014LowerCF,
  title={Lower critical field and SNS-Andreev spectroscopy of 122-arsenides: Evidence of nodeless superconducting gap},
  author={Mahmoud Abdel-Hafiez and Paulo J. Pereira and S. A. Kuzmichev and T. E. Kuzmicheva and V. M. Pudalov and Luminita Harnagea and Alexander A. Kordyuk and Alejandro V. Silhanek and Victor V. Moshchalkov and Bing Shen and Hai-Hu Wen and Alexander N. Vasiliev and Xiao-Jia Chen},
  journal={Physical Review B},
  year={2014},
  volume={90},
  pages={054524-1-054524-9}
}
Using two experimental techniques, we studied single crystals of the 122-FeAs family with almost the same critical temperature, T-c. We investigated the temperature dependence of the lower critical field H-c1(T) of a Ca0.32Na0.68Fe2As2 (T-c approximate to 34 K) single crystal under static magnetic fields H parallel to the c axis. The temperature dependence of the London penetration depth can be described equally well either by a single anisotropic s-wave-like gap or by a two-gap model, while a… 

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