Ambegaokar-Baratoff relations for Josephson critical current in heterojunctions with multigap superconductors
Yukihiro Ota, Noriyuki Nakai, Hiroki Nakamura, Masahiko Machida, Daisuke Inotani, Yoji Ohashi, Tomio Koyama, Hideki Matsumoto
DOI 10.1103/PhysRevB.81.214511 · Physical Review B
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Abstract
An extension of the Ambegaokar-Baratoff relation to a superconductor-insulator-superconductor (SIS) Josephson junction with multiple tunneling channels is derived. Applying the resultant relation to a SIS Josephson junction formed by an iron-based (five-band) and a single-band Bardeen-Cooper-Schrieffer (BCS) type superconductors, a theoretical bound of the Josephson critical current (Ic) multiplied by the resistance of the junction (Rn) is given. We reveal that such a bound is useful for identifying the pairing symmetry of iron-pnictide superconductors. One finds that if a measured value of IcRn is smaller than the bound then the symmetry is ±s wave, and otherwise s wave without any sign changes. In addition, we stress that temperature dependence of IcRn is sensitive to the difference of the gap functions from the BCS type gap formula in the above heterojunction.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Ba,K)Fe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
| LaFeAs(O,F) Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | unknown |
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