  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.
