Efficient electronic cooling by niobium-based superconducting tunnel junctions
J. Hätinen, A. Ronzani, R.P. Loreto, E. Mykkänen, A. Kemppinen, K. Viisanen, T. Rantanen, J. Geisor, J.S. Lehtinen, M. Ribeiro, J-P. Kaikkonen, O. Prakash, V. Vesterinen, C. Förbom, E.T. Mannila, M. Kervinen, J. Govenius, M. Prunnila
DOI 10.1103/PhysRevApplied.22.064048 · Physical Review Applied
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Replacing the bulky cryoliquid-based cooling stages of cryoenabled instruments by chip-scale refrigeration is envisioned to disruptively reduce the system size similar to microprocessors did for computers. Electronic refrigerators based on superconducting tunnel junctions have been anticipated to provide a solution, but reaching the necessary above the 1-K operation temperature range has remained a goal out of reach for several decades. We show efficient electronic refrigeration by Al-AlOx-Nb superconducting tunnel junctions starting from bath temperatures above 2 K. The junctions can deliver electronic cooling power up to approximately mW/mm2, which enables us to demonstrate tunnel-current-driven electron temperature reduction from 2.4 K to below 1.6 K (34% relative cooling) against the phonon bath. Our work shows that the key material of integrated superconducting circuits—niobium—enables powerful cryogenic refrigerator technology. This result is a prerequisite for practical cryogenic chip-scale refrigerators and, at the same time, it introduces a new electrothermal tool for quantum heat-transport experiments.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 9 | Pressure not reported | unknown |
| Al Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.38 | Pressure not reported | unknown |
Similar papers
Thermoelectric effects in superconductor-ferromagnet tunnel junctions on europium sulfide
similarity 0.94S. Kolenda et al.
Source status unknown — claims are unverified
Effect of low temperature baking in nitrogen on the performance of a niobium superconducting radio frequency cavity
similarity 0.94Pashupati Dhakal et al.
Source status unknown — claims are unverified
Interplay between topological insulators and superconductors
similarity 0.94Jian Wang et al.
Source status unknown — claims are unverified
Superconductivity, Fermi-liquid transport, and universal kinematic scaling relation for metallic thin films with stabilized defect complexes
similarity 0.94M. ElMassalami & M. B. Silva Neto
Source status unknown — claims are unverified
Understanding Quality Factor Degradation in Superconducting Niobium Cavities at Low Microwave Field Amplitudes
similarity 0.94A. Romanenko & D. I. Schuster
Source status unknown — claims are unverified
Topographic power spectral density study of the effect of surface treatment processes on niobium for superconducting radio frequency accelerator cavities
similarity 0.94Chen Xu et al.
Source status unknown — claims are unverified