Superconducting gap structure of FeSe

Lin Jiao, Chien Lung Huang, Sahana Rößler, Cevriye Koz, Ulrich K. Rößler, Ulrich Schwarz, Steffen Wirth

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)


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.

Original languageEnglish
Article number44024
JournalScientific reports
Publication statusPublished - 2017 Mar 7

All Science Journal Classification (ASJC) codes

  • General


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