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All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

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Disorder effects in pnictides: a tunneling spectroscopy study.

Y Noat¹, T Cren, V Dubost

¹Institut des Nanosciences de Paris, CNRS UMR 7588, Université Pierre et Marie Curie Paris 6, Paris, France. yves.noat@insp.jussieu.fr

Journal of Physics. Condensed Matter : an Institute of Physics Journal

|March 16, 2011

Summary

This summary is machine-generated.

This study explores superconducting iron chalcogenides and pnictides using tunneling spectroscopy. FeSe(0.5)Te(0.5) shows a single gap, while SmFeAsO compounds exhibit two gaps, suggesting different superconducting mechanisms.

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Area of Science:

Condensed Matter Physics
Materials Science
Superconductivity

Background:

Iron-based superconductors exhibit complex electronic properties.
Understanding the nature of superconducting gaps is crucial for technological applications.

Purpose of the Study:

To investigate the superconducting properties of FeSe(0.5)Te(0.5), SmFeAsO(0.85), and SmFeAsO(0.9)F(0.1) using tunneling spectroscopy.
To elucidate the pairing symmetry and electronic structure of these materials.

Main Methods:

Synthesis and characterization of superconducting samples.
Rietveld refinement of X-ray diffraction patterns.
Transport and magnetic measurements.
Tunneling spectroscopy.

Main Results:

FeSe(0.5)Te(0.5) displayed a single superconducting gap (~1 meV) consistent with BCS theory.
SmFeAsO(0.85) and SmFeAsO(0.9)F(0.1) showed complex spectra with two gaps (~4 meV and ~10 meV).
The observed spectra suggest a two-band superconductor with an 's ±' order parameter for SmFeAsO compounds.

Conclusions:

The tunneling spectra indicate distinct superconducting mechanisms in FeSe(0.5)Te(0.5) and SmFeAsO compounds.
Disorder-induced 's'-wave pairing is proposed for FeSe(0.5)Te(0.5) due to Se-Te substitution.
Interband quasiparticle scattering significantly influences the tunneling spectra of two-band superconductors.