We discuss experimental evidence of nonlocality in superconducting nanostructures: the variation of the magnitude of the order parameter Δ(r) induces a response at a remote point r′. It is shown that reasonable agreement with experiment can be achieved by assuming nonlocal integral relation between Δ(r) and Δ(r′) with the kernel function K(r,r′)∝ (1/|r - r′|)exp(- |r - r′|/ξ Δ). Numerically the correlation length ξ Δ is close to the effective Pippard's coherence length 0.18ξ 0 Pip, while its dependence on the critical temperature T c is different than the conventional diverging behavior at the critical point T → T c.
|Number of pages||6|
|Journal||Physical Review B (Condensed Matter and Materials Physics)|
|Publication status||Published - 1 Aug 2001|
|MoE publication type||A1 Journal article-refereed|