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The occurrence of the Berezinskii-Kosterlitz-Thouless (BKT) transition isinvestigated in heavily boron-doped nanocrystalline diamond films through acombination of current-voltage and resistance measurements. We observe a robustBKT transition in the nanocrystalline diamond films with smaller grain sizealong with transport features related to vortex pinning. The vortex core energydetermined through analysis of the resistance temperature curves was found tobe anti-correlated to the BKT transition temperatures. It is also observed thatthe higher BKT temperature is related to an increased vortex-antivortex bindingenergy derived from the activated transport regions. Further, the magneticfield induced superconductor insulator transition shows the possibility of thecharge glass state. The consequences of granularity such as localization andvortex pinning can lead to tuneable BKT temperatures and strongly affects thefield induced insulating state.

Observation of the Berezinskii-Kosterlitz-Thouless transition in Boron-doped diamond films