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Observation of a superconducting glass state in granular superconducting diamond

Klemencic, G. M., Fellows, J. M., Werrell, J. M., Mandal, S., Giblin, S. R., Smith, R. A. and Williams, O. A. 2019. Observation of a superconducting glass state in granular superconducting diamond. Scientific Reports 9 , 4578. 10.1038/s41598-019-40306-1

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The magnetic field dependence of the superconductivity in nanocrystalline boron doped diamond thin films is reported. Evidence of a superconducting glass state is presented, as demonstrated by the observation of a quasi de Almeida-Thouless line in the phase diagram and a logarithmic time dependence of the magnetism. The position of the phase boundary in the H-T plane is determined from electrical transport data by detailed fitting to quasi-zero-dimensional fluctuation conductivity theory. This allows determination of the boundary between resistive and non-resistive behaviour to be made with greater precision than the standard ad hoc onset/midpoint/offset criterion. We attribute the glassy superconductivity to the morphological granularity of the diamond films.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Publisher: Nature Publishing Group
ISSN: 2045-2322
Date of First Compliant Deposit: 14 February 2019
Date of Acceptance: 11 February 2019
Last Modified: 04 Aug 2022 02:03

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