Efficient Peltier refrigeration by a pair of normal metal/ insulator/superconductor junctions
M. M. Leivo, J. P. Pekola, D. V. Averin
Abstract
We suggest and demonstrate in experiment that two normal metal /insulator/ superconductor (NIS) tunnel junctions combined in series to form a symmetric SINIS structure can operate as an efficient Peltier refrigerator. Specifically, it is shown that the SINIS structure with normal-state junction resistances 1.0 and 1.1 kΩ is capable of reaching a temperature of about 100 mK starting from 300 mK. We estimate the corresponding cooling power to be 1.5 pW per total junction area of 0.8 μm2 at T= 300 mK.
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