Journal
SCIENTIFIC REPORTS
Volume 7, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep41728
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Funding
- Otaniemi research infrastructure for Micro and Nanotechnologies (OMN)
- European Community FP7 Marie Curie Initial Training Networks Action (ITN) [Q-NET 264034]
- INFERNOS grant [308850]
- Academy of Finland [250280, 272218, 286098, 275167]
- Academy of Finland (AKA) [286098, 286098, 275167, 275167] Funding Source: Academy of Finland (AKA)
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We determine the thermal conductance of thin niobium (Nb) wires on a silica substrate in the temperature range of 0.1-0.6 K using electron thermometry based on normal metal-insulator-superconductor tunnel junctions. We find that at 0.6 K, the thermal conductance of Nb is two orders of magnitude lower than that of Al in the superconducting state, and two orders of magnitude below the Wiedemann-Franz conductance calculated with the normal state resistance of the wire. The measured thermal conductance exceeds the prediction of the Bardeen-Cooper-Schrieffer theory, and demonstrates a power law dependence on temperature as T-4.5, instead of an exponential one. At the same time, we monitor the temperature profile of the substrate along the Nb wire to observe possible overheating of the phonon bath. We show that Nb can be successfully used for thermal insulation in a nanoscale circuit while simultaneously providing an electrical connection.
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