Fluctuation spectroscopy as a probe of granular superconducting diamond films

Abstract

We present resistance versus temperature data for a series of boron-doped nanocrystalline diamond films whose grain size is varied by changing the film thickness. Upon extracting the fluctuation conductivity near to the critical temperature we observe three distinct scaling regions -- 3D intragrain, quasi-0D, and 3D intergrain -- in confirmation of the prediction of Lerner, Varlamov and Vinokur. The location of the dimensional crossovers between these scaling regions allows us to determine the tunnelling energy and the Thouless energy for each film. This is a demonstration of the use of \emph{fluctuation spectroscopy} to determine the properties of a superconducting granular system.

References in corpus (4)

• Superconducting nanowire single-photon detectors: physics and applications
• Disorder-Induced Inhomogeneities of the Superconducting State Close to the Superconductor-Insulator Transition
• Superconductivity in CVD Diamond Thin Film Well-Above Liquid Helium Temperature
• Fluctuation spectroscopy of granularity in superconducting structures

Cited by in corpus (1)

• Superconducting boron doped nanocrystalline diamond on boron nitride ceramics