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October 2011 EPL, 96 (2011) 27014 www.epljournal.org

Summary: October 2011
EPL, 96 (2011) 27014 www.epljournal.org
doi: 10.1209/0295-5075/96/27014
Proximity fingerprint of są-superconductivity
A. E. Koshelev and V. Stanev
Materials Science Division, Argonne National Laboratory - Argonne, IL 60439, USA
received 17 June 2011; accepted in final form 6 September 2011
published online 7 October 2011
PACS 74.45.+c ­ Proximity effects; Andreev reflection; SN and SNS junctions
PACS 74.70.Xa ­ Pnictides and chalcogenides
PACS 74.20.Rp ­ Pairing symmetries (other than s-wave)
Abstract ­ We suggest a straightforward and unambiguous test to identify possible opposite signs
of the superconducting order parameter in different bands proposed for iron-based superconductors
(są-state). We consider the proximity effect in a weakly coupled sandwich composed of a
są-superconductor and a thin layer of the s-wave superconductor. In such system the s-wave
order parameter is coupled differently with different są-gaps and it typically aligns with one of
these gaps. This forces the other są-gap to be anti-aligned with the s-wave gap. In such situation
the aligned band induces a peak in the s-wave density of states (DoS), while the anti-aligned band
induces a dip. Observation of such contact-induced negative feature in the s-wave DoS would
provide a definite proof for są-superconductivity.


Source: Alexei, Koshelev - Materials Science Division, Argonne National Laboratory


Collections: Materials Science; Physics