Superconducting gap structure of FeSe

被引：45

作者：

Jiao, Lin ^{[1
]}

Huang, Chien-Lung ^{[1
,3
]}

Roessler, Sahana ^{[1
]}

Koz, Cevriye ^{[1
]}

Roessler, Ulrich K. ^{[2
]}

Schwarz, Ulrich ^{[1
]}

Wirth, Steffen ^{[1
]}

机构：

[1] Max Planck Inst Chem Phys Solids, Nothnitzer Str 40, D-01187 Dresden, Germany

[2] IFW Dresden, Postfach 270016, D-01171 Dresden, Germany

[3] Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA

来源：

SCIENTIFIC REPORTS | 2017年 / 7卷

关键词：

TEMPERATURE; SYMMETRY; PHASE; FILMS;

D O I：

10.1038/srep44024

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页数：8

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