Physics – Condensed Matter – Superconductivity
Scientific paper
2009-11-13
New J. Phys. 13, 025017 (2011)
Physics
Condensed Matter
Superconductivity
Scientific paper
10.1088/1367-2630/13/2/025017
We examine the possibility of probing superconductivity effects in metal nanoclusters via diamond magnetometry. Metal nanoclusters have been proposed as constitutive elements of high T$_c$ superconducting nanostructured materials. Magnetometry based on the detection of spin-selective fluorescence of nitrogen-vacancy (NV) centers in diamond is capable of nanoscale spatial resolution and could be used as a tool for investigating the properties of single or multiple clusters interacting among each other or with a surface. We have carried out sensitivity estimates and experiments to understand how these magnetometers could be used in such a situation. We studied the behavior of the sensor as a function of temperature and detected the flux exclusion effect in a superconductor by monitoring the [111]-orientation fine structure spectrum in high-NV density diamond. Our results show that phase transitions can be ascertained in a bulk superconductor with this technique while the principal zero field splitting parameter ($D$) demonstrates a temperature dependence that may require compensation schemes.
Acosta Victor M.
Bauch Erik
Bouchard Louis-S
Budker Dmitry
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