Scanning Hall probe microscopy of vortex patterns in a superconducting microsquare

Taichiro Nishio; Qinghua Chen; Werner Gillijns; Katrien De Keyser; Koen Vervaeke; Victor V. Moshchalkov

doi:10.1103/PhysRevB.77.012502

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Scanning Hall probe microscopy of vortex patterns in a superconducting microsquare

Taichiro Nishio, Qinghua Chen, Werner Gillijns, Katrien De Keyser, Koen Vervaeke, Victor V. Moshchalkov

DOI 10.1103/PhysRevB.77.012502 · Physical Review B

T1

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Abstract

We present direct observation of vortices confined to a superconducting 4×4μm2 square Pb film at 4.2K with a high resolution scanning Hall probe microscope. Integrals of the magnetic field penetrating the square as a function of the applied field show that an applied-field dependence of vorticity L agrees with calculations based on the Ginzburg-Landau (GL) equation for a square sample geometry. From asymmetric field distribution of the confined magnetic flux, the locations of vortices on the square are inferred for vorticities L=1–5. The obtained vortex patterns are analogous with the calculations in the framework of the full GL equation for temperatures considerably lower than the superconducting transition temperature Tc.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown
Pb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.2	Pressure not reported	unknown