摘要
We investigate a Josephson junction between a one-band and a multi-band s-wave superconductor.When the multi-band lead is an s±-wave superconductor,we find that the critical Josephson current may change its sign when the temperature changes.Our result confirms that this is a widespread effect of the s±-wave superconductor,independent of the type of the junction,the ratios of the gaps and superconducting transition temperatures,as long as the tunneling matrix elements have suitable values.This novel effect comes directly from the opposite gap signs.We propose that the observation of this phenomena can be used to detect the s±-wave pairing symmetry in iron-based superconductors.
作者
WANG Da
LU Hong-Yan
WANG Qiang-Hua
王达;路洪艳;王强华(National Laboratory of Solid State Microstructures,Nanjing University,Nanjing 210093;Department of Physics,University of California,San Diego,California 92093,USA;School of Physics and Electronic Information,Huaibei Normal University,Huaibei 235000)
基金
Supported by the National Natural Science Foundation of China under Grant Nos 11104099,10974086 and 11023002
the Ministry of Science and Technology of China under Grant Nos 2011CBA00108 and 2011CB922101
the Open Foundation from National Laboratory of Solid State Microstructures under Grant No M22010
the Natural Science Foundation of the Educational Department of Anhui Province under Grant No KJ2010B184.
