The Finite Temperature Effect on Josephson Junction between an s-Wave Superconductor and an s±-Wave Superconductor
WANG Da1,2, LU Hong-Yan1,3**, WANG Qiang-Hua1
1National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093 2Department of Physics, University of California, San Diego, California 92093, USA 3School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000
Abstract：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.
. [J]. 中国物理快报, 2013, 30(7): 77404-077404.
WANG Da, LU Hong-Yan, WANG Qiang-Hua. The Finite Temperature Effect on Josephson Junction between an s-Wave Superconductor and an s±-Wave Superconductor. Chin. Phys. Lett., 2013, 30(7): 77404-077404.
2013, Vol. 30 
