Superconducting Quantum Refrigerator: Breaking and Rejoining Cooper Pairs with Magnetic Field Cycles
Journal Article
·
· Physical Review Applied
- Univ. of Rochester, NY (United States); DOE/OSTI
- NEST, Pisa (Italy)
- Univ. of Rochester, NY (United States); Chapman Univ., Orange, CA (United States)
We propose a solid-state refrigeration technique based on repeated adiabatic magnetization and demagnetization cycles of a superconductor, which acts as the working substance. The gradual cooling down of a substrate (normal metal) in contact with the working substance is demonstrated for different initial temperatures of the substrate. Excess heat is given to a hot large-gap superconductor. The on-chip refrigerator works in a cyclic manner because of an effective thermal switching mechanism: heat transport between N-N versus N-S junctions is asymmetric because of the appearance of the energy gap. Furthermore, this switch permits selective cooling of the metal. We find that this refrigeration technique can cool down a 0.3 cm3 block of Cu by almost 2 orders of magnitude starting from 200 mK, and down to about 1 mK starting from the base temperature of a dilution fridge (10 mK). The corresponding cooling power at 200 and 10 mK for a 1 × 1 cm2 interface are 25 and 0.06 nW respectively, which scales with the area of the interface.
- Research Organization:
- Univ. of Rochester, NY (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0017890
- OSTI ID:
- 1612773
- Alternate ID(s):
- OSTI ID: 1512341
OSTI ID: 2222816
- Journal Information:
- Physical Review Applied, Journal Name: Physical Review Applied Journal Issue: 5 Vol. 11; ISSN 2331-7019
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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