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

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

2008-06-12

arxiv.org/abs/0806.1986v2

Supercond. Sci. Technol. 22 (2009) 015018 (6pp)

Physics

Condensed Matter

Superconductivity

5 pages, 5 figures

Scientific paper

10.1088/0953-2048/22/1/015018

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.

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