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• W2086923287 endingPage "R69" @default.
• W2086923287 startingPage "R47" @default.
• W2086923287 abstract "In high-Tc superconductors (HTS), which are layered, doped Mott insulators, weak links occur easily in preparation and growth, being weakened further by irradiation, by impurities and by disorder. CuO-plane weak links are the major obstacle for HTS currents, both dc and radio frequency. They are tunnel junctions that show reduced critical Josephson currents jcJ (A cm−2) and enhanced normal Rbn (Ω cm2) and leakage resistances Rbl (T < Tc) ≥ Rbn where the degradation of jcJRbn ≪ Δ/e with the superconducting energy gap Δ is specific to HTS. The easy occurrence of weak links and their degradations already in the normal superconducting state are consequences of the space-wise transition to a Mott insulator seam with nL∥ localized states by reduced wavefunction overlap at surfaces and by chemical or spatial disorder. The tunnel degradations show up in jcJ ∝ exp(−2κd), in j∥cJR∥bn ≈ Δ/10e exp(−κd) and in j∥cJR∥2bn ≈ j∥cJR∥2bl ≈ const ≥ c0 = 10−12 V Ω cm2 for all NCCO, YBCO, BSCCO and TBCCO junctions grown naturally or artificially to date. In-plane tunnel barriers of width d∥ > 0.2 nm and of height ϕ∥ ≈ 2 eV, housing nL∥ ≈ 1021 cm−3 localized states causing R∥bl ∝ 1/nL∥, are quantified for the first time by the resonant tunnel model in agreement with all experimental data, especially R∥bl-, j∥cJR∥bn- and j∥cJR∥2bn degradations. In interface engineered junctions, a modified, seemingly crystalline (YBCO)* layer of low barrier height ϕc ≲ 20 meV and width dc ≥ 1–5 nm, covered by the standard Mott insulating YBCO, acts as a controllable and integrable tunnel barrier. Perpendicular weak links with the quasi-insulating blocking layer as the tunnel barrier are dominated by d⊥ ≥ 0.8 nm and by nBL < 1021 cm−3, as the density of intermediate states depending strongly on doping yields j⊥cJR⊥bn and j⊥cJR⊥2bn values which are larger than for in-plane junctions. Comparing HTS junctions with Nb/Nb2O5−y and Nb/Al/AlOx(OH)y junctions shows the way out of this interface chemistry deadlock." @default.
• W2086923287 created "2016-06-24" @default.
• W2086923287 creator A5081892832 @default.
• W2086923287 date "2003-09-09" @default.
• W2086923287 modified "2023-09-26" @default.
• W2086923287 title "A review of weak/strong links and junctions in high-Tcsuperconductors as a transition to a Mott insulator" @default.
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