Disorder effects in pnictides : a tunneling spectroscopy study

Details Disorder effects in pnictides : a tunneling spectroscopy study Disorder effects in pnictides : a tunneling spectroscopy study

2010-07-19

arxiv.org/abs/1007.3151v2

Physics

Condensed Matter

Superconductivity

11 pages, 7 figures

Scientific paper

We present the synthesis and the tunneling spectroscopy study of superconducting FeSe0.5Te0.5 (Tc = 14 K), SmFeAsO0.85 (Tc = 45 K) and SmFeAsO0.9F0.1 (Tc = 52 K). The samples were characterized by Rietveld refinement of X-ray diffraction patterns and transport measurements. Tunneling experiments on FeSe0.5Te0.5 revealed a single superconducting gap of ~1 meV in BCS-like tunnelling conductance spectra. In SmFeAsO0.85 and SmFeAsO0.9F0.1 however, more complex spectra were observed characterized by two gap-like structures at ~4 meV and ~10 meV. These spectra are qualitatively understood assuming a two-band superconductor with a 's\pm' order parameter. We show that depending on the sign relation between the pairing amplitudes in the two bands, the interband quasiparticle scattering has a crucial effect on the shape of the tunneling spectra. Detailed analysis of the tunneling spectroscopy data supports the 's\pm' model, but single-gap spectra found in FeSe0.5Te0.5 are more compatible with a disorder-induced 's'-wave gap, due to the Se-Te substitution.

Affiliated with

Also associated with

No associations

Rating

Disorder effects in pnictides : a tunneling spectroscopy study does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Disorder effects in pnictides : a tunneling spectroscopy study, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disorder effects in pnictides : a tunneling spectroscopy study will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-62353