Half - h/2e - Oscillations of SQUIDs
Abstract
The current-voltage characteristics of Superconducting Quantum Interference Devices (SQUIDs) are known to modulate as a function of applied magnetic field with a period of one flux quantum Φ0=h/2e. Here we report on the fabrication and properties of SQUIDs modulating with a period of 1/2×Φ0. The characteristics of these bicrystal SQUIDs are consistent with either a strong sin(2ϕ) component of the current-phase relation of the Josephson current, or with an interaction between the Cooper-pairs, causing an admixture of quartets to the condensate.
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