Structure and Anisotropy of the Superconducting Order Parameter in Ba(0.65)K(0.35)Fe2As2 Probed by Andreev SpectroscopyстатьяИсследовательская статья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:The superconducting order parameters in optimally doped Ba(0.65)K(0.35)Fe2As2 single crystals have been directly measured using multiple Andreev reflection effect spectroscopy of superconductor–normal metal–superconductor break-junctions. We determine two superconducting gaps, which are nodeless in the k_x-k_y-plane of the momentum space, and resolve a substantial in-plane anisotropy of the large gap. The temperature dependences of the gaps indicate a strong coupling within the bands where Δ_L develops, a weak coupling in the condensate with the small gap Δ_S, and a moderate interband interaction between the two condensates. The own critical temperatures of both condensates have been estimated (under the hypothetical assumption of zero interband interaction).