Fluxoid dynamics in superconducting thin film rings
J.R. Kirtley (1), C.C. Tsuei (1), V.G. Kogan (2), J.R. Clem (2), H., Raffy (3), Z.Z. Li (3) ((1) IBM Research, (2) Ames Laboratory, (3) U. Paris,, Sud)
TL;DR
This study investigates how magnetic fluxoids enter and exit superconducting thin film rings of Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$, revealing thermally activated vortex dynamics through scanning SQUID microscopy.
Contribution
It provides the first detailed measurement of fluxoid dynamics in high-temperature superconductor rings using a variable temperature scanning SQUID.
Findings
Fluxoid number changes via thermally activated vortex nucleation.
Vortex transport across the ring wall explains fluxoid dynamics.
Results align qualitatively with a vortex nucleation and transport model.
Abstract
We have measured the dynamics of individual magnetic fluxoids entering and leaving photolithographically patterned thin film rings of the underdoped high-temperature superconductor BiSrCaCuO, using a variable sample temperature scanning SQUID microscope. These results can be qualitatively described using a model in which the fluxoid number changes by thermally activated nucleation of a Pearl vortex in, and transport of the Pearl vortex across, the ring wall.
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