Observation of a superconducting glass state in granular superconducting diamond

G M Klemencic, J M Fellows, J M Werrell, S Mandal, S R Giblin, R A Smith, O A Williams

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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.

Original languageEnglish
Article number4578
Number of pages8
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 14 Mar 2019

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