Superconducting gap structure of FeSe

The microscopic mechanism governing the zero-resistance flow of current in some iron-based, high-temperature superconducting materials is not well understood up to now. A central issue concerning the investigation of these materials is their superconducting gap symmetry and structure. Here we presen...

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Bibliographic Details
Published in:Scientific reports 2017-03, Vol.7 (1), p.44024-44024, Article 44024
Main Authors: Jiao, Lin, Huang, Chien-Lung, Rößler, Sahana, Koz, Cevriye, Rößler, Ulrich K., Schwarz, Ulrich, Wirth, Steffen
Format: Article
Language:English
Subjects:
639/766/119/1003
639/766/119/995
Anisotropy
Crystal structure
Experiments
Heat
High temperature
Humanities and Social Sciences
Iron
Low temperature
Magnetic fields
Microscopy
multidisciplinary
Phase transitions
Scanning
Science
Single crystals
Specific heat
Symmetry
Temperature effects
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Summary:The microscopic mechanism governing the zero-resistance flow of current in some iron-based, high-temperature superconducting materials is not well understood up to now. A central issue concerning the investigation of these materials is their superconducting gap symmetry and structure. Here we present a combined study of low-temperature specific heat and scanning tunnelling microscopy measurements on single crystalline FeSe. The results reveal the existence of at least two superconducting gaps which can be represented by a phenomenological two-band model. The analysis of the specific heat suggests significant anisotropy in the gap magnitude with deep gap minima. The tunneling spectra display an overall “U”-shaped gap close to the Fermi level away as well as on top of twin boundaries. These results are compatible with the anisotropic nodeless models describing superconductivity in FeSe.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep44024