Persistence of superconductivity in niobium ultrathin films grown on R-Plane Sapphire
arXiv:1102.0442 · doi:10.1103/PhysRevB.83.144504
Abstract
We report on a combined structural and electronic analysis of niobium ultrathin films (from 2 to 10 nm) deposited in ultra-high vacuum on atomically flat R-plane sapphire wafers. A textured polycrystalline morphology is observed for the thinnest films showing that hetero-epitaxy is not achieved under a thickness of 3.3nm, which almost coincides with the first measurement of a superconducting state. The superconducting critical temperature rise takes place on a very narrow thickness range, of the order of a single monolayer (ML). The thinnest superconducting sample (3 nm/9ML) has an offset critical temperature above 4.2K and can be processed by standard nanofabrication techniques to generate air- and time-stable superconducting nanostructures, useful for quantum devices.
22 pages, 8 figures, to appear in Physical Review B (2011)
References in corpus (6)
- Nature of the superconductor-insulator transition in disordered superconductors
- Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
- Tunneling study of cavity grade Nb: possible magnetic scattering at the surface
- Size induced metal insulator transition in nanostructured Niobium thin films: Intragranular and intergranular contributions
- Niobium superconducting nanowire single-photon detectors
- Optimizing the flux coupling between a nanoSQUID and a magnetic particle using atomic force microscope nanolithography
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