Fluctuation Spectroscopy in Boron-doped Nanocrystalline Diamond Films

Add to your list(s) Download to your calendar using vCal

• Dave Perkins
• Thursday 07 January 2021, 13:00-14:00
• https://bham-ac-uk.zoom.us/j/88054699316?pwd=dVA4RDY5N0hiczJVUWlRZW5PTlZrZz09.

If you have a question about this talk, please contact Rose Davies.

Superconducting fluctuations provide a way for us to probe the properties of a material with a superconducting transition. In general, by fitting theory to experiment we can find the transition temperature accurately without the need for arbitrary definitions (e.g. 10%, 50%, or 90% of normal state resistance), and to determine the dimensionality of the system. Extending these ideas to granular systems allows us to further probe their properties to determine the electron tunnelling rate and Thouless energy for a particular sample.

In this talk I present fittings to experimental measurements of the temperature dependence of electrical conductivity taken from Boron-doped Nanocrystalline Diamond films, and extract the fluctuation conductivity corrections. We observe transitions from 3D to quasi-0D and back to 3D as we approach the transition temperature. I will construct a theory describing superconducting fluctuations in granular metals to explain these observations.

This talk is part of the Theoretical Physics Journal Club and Group Meeting series.

This talk is included in these lists:

• Theoretical Physics Journal Club and Group Meeting
• https://bham-ac-uk.zoom.us/j/88054699316?pwd=dVA4RDY5N0hiczJVUWlRZW5PTlZrZz09

Note that ex-directory lists are not shown.