Magnetic-field-tuned superconductor-to-insulator transitions in amorphous Bi films with nanoscale hexagonal arrays of holes

摘要

We have observed multiple magnetic field driven superconductor-to-insulator transitions (SIT) in amorphous Bi films perforated with a nanohoneycomb (NHC) array of holes. The period of the magnetoresistance, H =H_M=h/2eS, where S is the area of a unit cell