CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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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
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Cite this article: |
WANG Da, LU Hong-Yan, WANG Qiang-Hua 2013 Chin. Phys. Lett. 30 077404 |
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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.
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Received: 08 April 2013
Published: 21 November 2013
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PACS: |
74.50.+r
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(Tunneling phenomena; Josephson effects)
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74.20.Rp
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(Pairing symmetries (other than s-wave))
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74.70.Xa
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(Pnictides and chalcogenides)
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Abstract
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