INTERFERENCE EFFECT HEAT CONDUCTANCE IN A JOSEPHSON-JUNCTION AND ITS DETECTION IN AN RF SQUID

The energy current through a superconductor-insulator-superconductor J osephson junction consists of a quasiparticle current, an interference current, and a pair current. The quasiparticle part represents the no rmal dissipative heat current. This part is shown to have a unique tem perature dependence. The other two parts depend on the phase drop acro ss the junction theta. When the junction is biased by a fixed temperat ure drop, the interference current can flow in either direction, depen ding on the sign of cos theta. This gives rise to an effect in which t he total heat current oscillates with the phase drop across the juncti on. We suggest an experimental setup involving an rf superconducting q uantum interference device, which is designed to measure these effects .