Abstract
The predominant d-wave pairing symmetry in high temperature superconductors leads toan unconventional current–phase relation in Josephson junctions. This circumstance mayinduce new effects in the dynamics of dc SQUIDs. In this contribution we report on themeasurements of the dependence of the SQUID Josephson current on the external magneticfield taken at very low temperatures, down to 20 mK. Different grain boundaries have beenfabricated by using the biepitaxial and the bicrystal technique. Some of the effects whichare induced by a nonsinusoidal current–phase relation can be clearly identified in thedynamics of the SQUIDs. The experimental data are also compared with theoreticalsimulations taking into account the inductance of the loop. The data show that, in specificconditions, a non-negligible inductance of the loop can induce effects similar toan unconventional current–phase relation, with a pronounced second harmonicsin(2φ) term. This fact has to be taken into account when designing d-wave SQUIDs for quantumcircuitry.
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