Observation of a superconducting glass state in granular superconducting diamond

Klemencic, G. M. ORCID: https://orcid.org/0000-0002-2125-9754, Fellows, J. M., Werrell, J. M., Mandal, S. ORCID: https://orcid.org/0000-0001-8912-1439, Giblin, S. R. ORCID: https://orcid.org/0000-0003-1876-8619, Smith, R. A. and Williams, O. A. ORCID: https://orcid.org/0000-0002-7210-3004 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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Abstract

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:	26 Sep 2023 18:49
URI:	https://orca.cardiff.ac.uk/id/eprint/119548

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