Resistivity of normal metal microbridge in the magnetic field of single Abrikosov vortex

This paper is aimed to attract attention to a possibility of recording a single Abrikosov vortex and study of it s motion in the microbridge-like structures. This has become possible by means of measurements of a change in the normal metal resistance which appears under the influence of a vortex magnetic field (MF). A structure under investigation: n+GaAS epilayer of the isolating substrate with a type-II superconducting film (Pb film of ∼103 Angstrom thickness) on top of it. Using the electron beam lithography the authors made in this structure a conducting channel with submicron dimensions shaped as a microbridge. Measured was the resistance of the normal metal - n+GaAs - in the magnetic field (the epilayer and superconductor were electrically isolated by the Schottky barrier). Without the superconducting film (upper layer) the authors observed a field dependence of the n-layer resistance. It is seen that in high magnetic fields there observed a periodical mesoscopic oscillations of the magnetoresistance which indicate, in particular, a submicron character of the structure. In low magnetic fields (<1 KOe) there observed a strong negative magnetoresistance caused by a weak localization. The latter is characterized by the inelastic length lφ ∼ 0.5 μm. The observed strong dependence of the resistance versus the MF (in low field) was used for vortex detection