The Finite Temperature Effect on Josephson Junction between an s-Wave Superconductor and an s±-Wave Superconductor

doi:10.1088/0256-307X/30/7/077404

Chin. Phys. Lett.

2013, Vol. 30

Issue (7): 077404 DOI: 10.1088/0256-307X/30/7/077404

CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

The Finite Temperature Effect on Josephson Junction between an s-Wave Superconductor and an s_±-Wave Superconductor

WANG Da^1,2, LU Hong-Yan^1,3**, 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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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.

Received: 08 April 2013 Published: 21 November 2013

PACS:	74.50.+r	(Tunneling phenomena; Josephson effects)
	74.20.Rp	(Pairing symmetries (other than s-wave))
	74.70.Xa	(Pnictides and chalcogenides)

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https://cpl.iphy.ac.cn/10.1088/0256-307X/30/7/077404 OR https://cpl.iphy.ac.cn/Y2013/V30/I7/077404

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