Micro-SQUID characteristics

Details Micro-SQUID characteristics Micro-SQUID characteristics

2001-10-24

arxiv.org/abs/cond-mat/0110517v1

Physics

Condensed Matter

Superconductivity

7 pages 8 figures

Scientific paper

We report on the dependence on field and temperature of the critical current of micro-SQUIDs: SQUIDs with diameters as small as 1 micron, using Dayem bridges as weak links. We model these SQUIDs by solving the Ginzburg-Landau equations with appropriate boundary conditions to obtain the supercurrent-phase relationships. These solutions show that the phase drops and depression of the order parameter produced by supercurrent flow are often distributed throughout the micro-SQUID structure, rather than being localized in the bridge area, for typical micro-SQUID geometries and coherence lengths. The resultant highly non-sinusoidal current-phase relationships $I_c(\phi)$ lead to reduced modulation depths and triangular dependences of the micro-SQUID critical currents on applied magnetic flux $I_c(\Phi)$. Our modelling agrees well with our measurements on both Al and Nb micro-SQUIDs.

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