The Influence of the Second Harmonic in the Current-Phase Relation on the Voltage-Current Characteristic of high TC DC SQUID

TL;DR

This paper develops a theory for high-Tc DC SQUIDs that incorporates the second harmonic in the current-phase relation, explaining deviations in voltage modulation observed experimentally.

Contribution

The paper introduces a theoretical model including the second harmonic in the current-phase relation, improving understanding of high-Tc DC SQUID behavior.

Findings

Second harmonic significantly affects voltage-current characteristics.

Theory aligns with experimental deviations from sinusoidal models.

Highlights importance of non-sinusoidal current-phase relations in high-Tc SQUIDs.

Abstract

A theory for the voltage-current characteristic in high TC DC SQUIDs, which accounts for a second harmonic in the junction current-phase relation, is developed. The comparison with experiment is performed. It is shown that if the second harmonic is prevailed, the theory can explain the large deviations of the experimental voltage modulation from theoretical predictions and computer simulations based on conventional sinusoidal current-phase relation.