Superconducting quantum interference device without Josephson junctions
  A new type of a superconducting quantum interference device (SQUID) based on a single superconducting loop without Josephson junctions and with asymmetric link-up of current leads is proposed. This SQUID offers advantages in simplicity of fabrication and higher sensitivity of magnetic flux. Magnetic field dependence of the critical current in aluminium rings with asymmetric link-up of current leads has been measured in order to confirm the possibility of making this type of SQUID. 
A. A. Burlakov, V. L. Gurtovoi, A. I. Ilin, A. V. Nikulov, and V. A.   Tulin
cond-mat.supr-con