Journal
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
Volume 31, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-6668/aa954b
Keywords
superconductivity; quantum phase slips; negative magnetoresistance; silicides; nanowire
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Funding
- Academy of Finland [288907, 287768]
- Wihuri foundation
- European Union's Horizon research and innovation programme [688539]
- Academy of Finland (AKA) [288907, 287768, 288907, 287768] Funding Source: Academy of Finland (AKA)
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We have fabricated disordered superconducting nanowires of molybdenium silicide. A molybdenium nanowire is first deposited on top of silicon, and the alloy is formed by rapid thermal annealing. The method allows tuning of the crystal growth to optimize e.g. the resistivity of the alloy for potential applications in quantum phase slip (QPS) devices and superconducting nanowire single-photon detectors. The wires have effective diameters from 42 to 79 nm, enabling the observation of crossover from conventional superconductivity to regimes affected by thermal and quantum fluctuations. In the smallest diameter wire and at temperatures well below the superconducting critical temperature, we observe residual resistance and negative magnetoresistance, which can be considered as fingerprints of QPSs.
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