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Related Experiment Video

Updated: Jun 5, 2026

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)
10:42

Combining Solid-state and Solution-based Techniques: Synthesis and Reactivity of Chalcogenidoplumbates(II or IV)

Published on: December 29, 2016

Multiband superconductivity in the Chevrel phases SnMo6S8 and PbMo6S8.

A P Petrović1, R Lortz, G Santi

  • 1DPMC-MaNEP, Université de Genève, Quai Ernest-Ansermet 24, 1211 Genève 4, Switzerland.

Physical Review Letters
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Superconducting Chevrel phases, SnMo6S8 and PbMo6S8, exhibit two distinct energy gaps, confirmed by spectroscopy and heat capacity measurements. These findings support an anisotropic, two-band superconductivity model in these materials.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Superconductivity

Background:

  • Chevrel phases are known for their unique superconducting properties.
  • Understanding the nature of superconductivity in these materials is crucial for developing new superconducting technologies.

Purpose of the Study:

  • To investigate the superconducting gap structure in SnMo6S8 and PbMo6S8 using sub-Kelvin scanning tunneling spectroscopy.
  • To determine the anisotropy and number of superconducting gaps present in these materials.

Main Methods:

  • Sub-Kelvin scanning tunneling spectroscopy (STS) was performed on SnMo6S8 and PbMo6S8.
  • Electronic heat capacity measurements were conducted to corroborate STS findings.

Main Results:

  • Two distinct superconducting gaps were observed in both SnMo6S8 (Δ1=3 meV, Δ2∼1.0 meV) and PbMo6S8 (Δ1=3.1 meV, Δ2∼1.4 meV).
  • The superconducting gap distribution was found to be highly anisotropic, with Δ2 particularly evident on specific crystallographic planes.
  • Spectroscopic data were accurately modeled using an anisotropic two-band Bardeen-Cooper-Schrieffer (BCS) s-wave gap function.

Conclusions:

  • The results strongly support a two-gap superconductivity scenario in Chevrel phases.
  • The observed anisotropy provides insights into the momentum-dependent nature of superconductivity in these materials.