A new kind of superconducting device, a 4-terminal SQUID, has been fab
ricated. It consists of a Josephson 4-terminal junction of which two t
erminals are short-circuited by a superconducting ring and the other t
wo are connected to a current source, forming the transport circuit. O
scillations in the voltage at constant currents through the transport
circuit are observed when a magnetic field applied to the ring changes
.