<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">d</mi></math></span>-Wave Induced Zero-Field Resonances in dc <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">π</mi></math></span>-Superconducting Quantum Interference Devices

B. Chesca; R. R. Schulz; B. Goetz; C. W. Schneider; H. Hilgenkamp; J. Mannhart

doi:10.1103/PhysRevLett.88.177003

$d$ -Wave Induced Zero-Field Resonances in dc $π$ -Superconducting Quantum Interference Devices

B. Chesca, R. R. Schulz, B. Goetz, C. W. Schneider, H. Hilgenkamp, and J. Mannhart

Phys. Rev. Lett. 88, 177003 – Published 16 April 2002

Abstract

A dc $π$ SQUID consists of a superconducting ring interrupted by two Josephson junctions, one of which carries in equilibrium a $π$ phase difference, caused, for example, by the $d$ -wave pairing symmetry of the high- $T_{c}$ cuprates. If this phase shift is maintained in the voltage state, anomalous resonance currents are expected in the SQUIDs transport characteristics. Here we report the observation of such resonances for high- $T_{c}$ dc $π$ SQUIDs, providing evidence for the influence of the $d$ -wave symmetry on the voltage state of a Josephson junction for frequencies of several tens of GHz.

Received 19 April 2001

DOI:https://doi.org/10.1103/PhysRevLett.88.177003

Authors & Affiliations

B. Chesca^1,2, R. R. Schulz¹, B. Goetz¹, C. W. Schneider¹, H. Hilgenkamp^1,3, and J. Mannhart¹

¹Experimentalphysik VI, Center for Electronic Correlations and Magnetism, Institute of Physics, University of Augsburg, D-86135 Augsburg, Germany
²Experimentalphysik II, University of Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany
³Low Temperature Division, Applied Physics Department and MESA+ Institute, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands