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Superconducting gap structure of FeSe
Lin Jiao1, Chien-Lung Huang1, Sahana Rößler1
1Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187 Dresden, Germany.
Scientific Reports
|March 8, 2017
Summary
Investigating iron-based superconductors, this study reveals at least two superconducting gaps in FeSe. These findings support anisotropic, nodeless models for high-temperature superconductivity.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Solid-State Physics
Background:
- The mechanism of high-temperature superconductivity in iron-based materials remains incompletely understood.
- Determining the superconducting gap symmetry and structure is crucial for advancing research in this field.
Purpose of the Study:
- To investigate the superconducting gap symmetry and structure in single crystalline FeSe.
- To elucidate the microscopic mechanisms behind zero-resistance current flow in iron-based superconductors.
Main Methods:
- Combined low-temperature specific heat measurements.
- Scanning tunnelling microscopy (STM) on single crystalline FeSe.
Main Results:
- Evidence for at least two superconducting gaps in FeSe, consistent with a two-band model.
- Specific heat analysis indicates significant anisotropy in gap magnitude with deep minima.
- STM spectra reveal a "U"-shaped superconducting gap near the Fermi level, present on and off twin boundaries.
Conclusions:
- The experimental results align with anisotropic, nodeless models for superconductivity in FeSe.
- This study provides critical insights into the complex nature of superconductivity in iron-based materials.
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