Journal
JOURNAL OF APPLIED PHYSICS
Volume 104, Issue 9, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3013444
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Funding
- IRC in Nanotechnology
- EPSRC [EP/F035411/1]
- EPSRC [EP/F035411/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [GR/R45680/01, EP/F035411/1] Funding Source: researchfish
- Medical Research Council [qA137861b] Funding Source: researchfish
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We have grown tungsten-containing films by focused-ion-beam (FIB)-induced chemical vapor deposition. The films lie close to the metal-insulator transition with an electrical conductivity which changes by less than 5% between room temperature and 7 K. The superconducting transition temperature T-c of the films can be controlled between 5.0 and 6.2 K by varying the ion-beam deposition current. The Tc can be correlated with how far the films are from the metal-insulator transition, showing a nonmonotonic dependence, which is well described by the heuristic model of [Osofsky et al., Phys. Rev. Lett. 87, 197004 (2001)]. Our results suggest that FIB direct-writing of W composites might be a potential approach to fabricate mask-free superconducting devices as well as to explore the role of reduced dimensionality on superconductivity. (C) 2008 American Institute of Physics. [DOI: 10.1063/1.3013444]
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