Current-Phase-Relation measurements of superconducting Niobium rings with a scanning SQUID microscope

  Anders V. Bjørlig [1]  ,  Irina Volotsenko [1]  ,  Aviad Frydman [1]  ,  Beena Kalisky [1]  
[1] Department of Physics and Institute of Nanotechnology and Advanced Materials, Bar-Ilan University, Ramat Gan 5290002, Israel.

The Current-Phase-Relation (CPR) of a Josephson junction can reveal information about the characteristics of the junction material, assisting the study of hybrid superconducting systems and novel materials. In this work we study the CPR of Niobium rings near the critical temperature, TC. We use a scanning superconducting-quantum-interference-device (SQUID), a highly sensitive magnetometer. We apply a local magnetic field near the ring changing the phase and use the SQUID to track the magnetic response from the ring-current. In my poster I will show CPR data from the Nb rings demonstrating the capability of the scanning SQUID. Our next step is to study rings with junctions of interesting materials.