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Phase slips and metastability in granular boron-doped nanocrystalline diamond microbridges

Klemencic, G.M., Perkins, D. T. S., Fellows, J. M., Muirhead, C. M., Smith, R. A., Mandal, S., Manifold, S., Salman, M., Giblin, S. R. and Williams, O. A. 2021. Phase slips and metastability in granular boron-doped nanocrystalline diamond microbridges. Carbon 175 , pp. 43-49. 10.1016/j.carbon.2020.12.042

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Abstract

A phase slip is a localized disturbance in the coherence of a superconductor allowing an abrupt 2π phase shift. Phase slips are a ubiquitous feature of one-dimensional superconductors and also have an analogue in two-dimensions. Here we present electrical transport measurements on boron-doped nanocrystalline diamond (BNCD) microbridges where, despite their three-dimensional macroscopic geometry, we find clear evidence of phase slippage in both the resistance-temperature and voltage-current characteristics. We attribute this behavior to the unusual microstructure of BNCD. We argue that the columnar crystal structure of BNCD forms an intrinsic Josephson junction array that supports a line of phase slippage across the microbridge. The voltage-state in these bridges is metastable and we demonstrate the ability to switch deterministically between different superconducting states by applying electromagnetic noise pulses. This metastability is remarkably similar to that observed in δ-MoN nanowires, but with a vastly greater response voltage.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Elsevier
ISSN: 0008-6223
Date of First Compliant Deposit: 17 December 2020
Date of Acceptance: 11 December 2020
Last Modified: 30 Sep 2022 17:45
URI: https://orca.cardiff.ac.uk/id/eprint/137076

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