2000/06/01 by I. O. Kulik, Kulik, I. O., Hüseyin Boyacı +4
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity in MgB2 and Alloys #Surface and Thin Film Phenomena #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0006003
6 pages, 4 figures. "International Symposium on Mesoscopic Superconductivity", Atsugi,Japan, 2000. Will be published in Physica B
arxiv created 2000/06/01 · openalex publication_date 2000/06/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Superconductivity in small metallic specimens is studied with regard to the size dependence of the "parity gap" (DeltaP), a parameter distinguishing between the energy of even and odd number of electrons in the granule. DeltaP is shown to be an increasing function of level spacing delta. The energy gap of superconductor Delta, on the other hand, decreases with increasing delta and vanishes at delta=deltac which is of the order of Delta. However, nonzero value of DeltaP persists above deltac in a "gapless" superconducting-insulating state. Level degeneracy in small specimens having perfect geometry changes the size dependence of the parity gap, the Josephson effect, and flux quantization. Parity gap is evaluated using an interpolation procedure between the continuum limit (delta<>Delta), for which an exact solution to the pairing problem is provided with the numeric diagonalization of system Hamiltonian in a small metallic cluster.