Nodal Superconductivity with Multiple Gaps in SmFeAsO$_{0.9}$F$_{0.1}$

Yonglei Wang; Lei Shan; Lei Fang; Peng Cheng; Cong Ren; Hai-Hu Wen

doi:10.1088/0953-2048/22/1/015018

Nodal Superconductivity with Multiple Gaps in SmFeAsO$_{0.9}$F$_{0.1}$

Superconductivity 2008-12-02 v2

Authors: Yonglei Wang , Lei Shan , Lei Fang , Peng Cheng , Cong Ren , Hai-Hu Wen

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Abstract

We report the observation of two gaps in the superconductor SmFeAsO $_{0.9}$ F $_{0.1}$ (F-SmFeAsO) with $T_c=51.5K$ as measured by point-contact spectroscopy. Both gaps decrease with temperature and vanish at $T_c$ and the temperature dependence of the gaps are described by the theoretical prediction of the Bardeen-Cooper-Schrieffer (BCS) theory. A zero-bias conductance peak (ZBCP) was observed, indicating the presence of Andreev bound states at the surface of F-SmFeAsO. Our results strongly suggest an unconventional nodal superconductivity with multiple gaps in F-SmFeAsO.

Keywords

nodal superconductivity multiple gaps point-contact spectroscopy SmFeAsO Andreev bound states zero-bias conductance peak BCS theory unconventional superconductivity

Cite

@article{arxiv.0806.1986,
  title  = {Nodal Superconductivity with Multiple Gaps in SmFeAsO$_{0.9}$F$_{0.1}$},
  author = {Yonglei Wang and Lei Shan and Lei Fang and Peng Cheng and Cong Ren and Hai-Hu Wen},
  journal= {arXiv preprint arXiv:0806.1986},
  year   = {2008}
}

Comments

5 pages, 5 figures

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