Physics – Condensed Matter – Superconductivity
Scientific paper
2012-01-13
Physics
Condensed Matter
Superconductivity
17 pages, 4 figures, plus supplementary materials (5 pages, 4 figures)
Scientific paper
Point-contact Andreev reflection (AR) spectroscopy has been an important tool for the study of superconductors. However, there remain significant challenges to overcome poor thermal and mechanical stability and the lack of diagnostic information on normal metal/superconductor (N-S) point contacts. In particular, for recently discovered Fe-based superconductors, diagnostic information is indispensable due to a degraded surface layer at the N-S point contact. Here we describe a distinct experimental method for AR spectroscopy with diagnostic capability via a design of nano-scale N-S devices with excellent thermal and mechanical stability, and have employed it to unveil the existence of two energy gaps in Fe1+yTe1-xSex which is crucial for understanding its pairing mechanism. Our approach can be widely applied for the study of various types of superconductors, and provide fundamental information inaccessible via traditional methods.
De Debtanu
Diaz-Pinto Carlos
Peng Haibing
Wu Zheng
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