Negative differential conductance in nano-scale normal metal/superconductor/ normal metal junctions featuring Fe1+yTe1-xSex

作者：De Debtanu; Diaz Pinto Carlos; Wu Zheng; Peng Haibing^*

来源：Philosophical Magazine, 2012, 92(31): 3824-3832.

DOI：10.1080/14786435.2012.691219

• iron-based superconductor
• nanostructures
• Andreev reflection
• electron transport

Iron-based superconductors have been the subject of intensive study due to their high transition temperature and intriguing physical mechanisms. We describe a unique experimental approach to fabricate nano-scale normal metal/superconductor/normal metal junctions involving microcrystals of Fe1+yTe1-xSex, for which we have observed a distinct phenomenon of negative differential conductance (NDC) dips along with multiple plateau features in differential conductance spectra. The evolution of the NDC dips and the plateau features is further explored as a function of both temperature and magnetic field, and their physical origin is discussed.

• 出版日期2012