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Phase-Sensitive Evi...
Phase-Sensitive Evidence for the Sign-Reversal s± Symmetry of the Order Parameter in an Iron-Pnictide Superconductor Using Nb/Ba1−xNaxFe2As2 Josephson Junctions
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- Kalenyuk, Aleksey A. (författare)
- Stockholms universitet,Fysikum,Institute of Metal Physics of National Academy of Sciences of Ukraine, Ukraine
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- Pagliero, Alessandro (författare)
- Stockholms universitet,Fysikum
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- Borodianskyi, Evgenii A. (författare)
- Stockholms universitet,Fysikum
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Kordyuk, A. A. (författare)
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- Krasnov, Vladimir M. (författare)
- Stockholms universitet,Fysikum
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(creator_code:org_t)
- 2018
- 2018
- Engelska.
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Ingår i: Physical Review Letters. - 0031-9007 .- 1079-7114. ; 120:6
- Relaterad länk:
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https://arxiv.org/ab...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- Josephson current provides a phase-sensitive tool for probing the pairing symmetry. Here we present an experimental study of high-quality Josephson junctions between a conventional s-wave superconductor Nb and a multiband iron-pnictide Ba1−xNaxFe2As2. Junctions exhibit a large enough critical current density to preclude the d-wave symmetry of the order parameter in the pnictide. However, the IcRn product is very small ≃3μV, which is not consistent with the sign-preserving s++ symmetry either. We argue that the small IcRn value, along with its unusual temperature dependence, provides evidence for the sign-reversal s± symmetry of the order parameter in Ba1−xNaxFe2As2. We conclude that it is the phase sensitivity of our junctions that leads to an almost complete (below a subpercent) cancellation of supercurrents from sign-reversal bands in the pnictide.
Ämnesord
- NATURVETENSKAP -- Fysik -- Den kondenserade materiens fysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Condensed Matter Physics (hsv//eng)
Nyckelord
- Unconventional superconductivity
- Tunneling
- Josephson effect
- Physics
- fysik
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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