Composite Flux-Line Lattices Stabilized in Superconducting Films by a Regular Array of Artificial Defects

M. Baert; V. V. Metlushko; R. Jonckheere; V. V. Moshchalkov; Y. Bruynseraede

doi:10.1103/PhysRevLett.74.3269

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Composite Flux-Line Lattices Stabilized in Superconducting Films by a Regular Array of Artificial Defects

M. Baert, V. V. Metlushko, R. Jonckheere, V. V. Moshchalkov, Y. Bruynseraede

DOI 10.1103/PhysRevLett.74.3269 · Physical Review Letters

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Abstract

Flux creep rate and critical current have been measured in superconducting Pb /Ge multilayers with a square lattice of submicron holes. The new composite flux-line lattices consisting of single or multiquanta vortices at holes and single cortices at interstitial positions have been identified. The “metallic” behavior of the flux lines at the interstices at temperatures close to the critical temperature leads to a first-order phase transition analogous to the Mott insulator-metal transition for flux lines, introduced by Nelson and Vinokur.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb/Ge Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	6.9	Pressure not reported	onset