Localization Effects on the Critical Current of a Superconductor—Normal-Metal—Superconductor Junction

Interaction effects associated with Anderson localization are confirmed for the critical current in a superconductor—normal-metal—superconductor junction using $p$-type InAs as the normal metal. In the weak localization regime and with decreasing temperature the critical current shows a saturated temperature dependence which agrees well with a theoretical prediction. In the strong localization regime the critical current decreases with lowering temperature.