Abstract
The influence of external environment on the heat transport through a tunnel junction connecting a normal-metal and a superconductor is analyzed theoretically. It is demonstrated that at finite temperatures finite impedance of the junction electrodes, limits the maximum amount of heat that can be extracted from the normal-metal via the electric current and thus reduces the efficiency of the thermoelectric electron refrigeration. This behaviour is more pronounced for charging energies E c of the junction, larger than the superconducting gap Δ and persists for a wide range of values of the impedance.
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