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Communication Dans Un Congrès Année : 2023

Quantum diamond magnetometry for high pressure sensing

Résumé

Diamond anvil cell (DAC) technology is widely used to study materials under high pressure. These materials can exhibit exotic phases of matter such as superconductivity with exceptionally high critical temperatures. The main difficulty with using the DAC lies in the challenge to measure magnetic properties at high pressure (above 100 GPa) due to the minute sample size. In our work, we perform high-pressure magnetometry by using nitrogen-vacancy (NV) centers implanted at the anvil culet surface of the DAC. Using a confocal microscope, we observe the spin dependent luminescence of NV centers, to perform a mapping of the magnetic field at the diamond anvil tip. Expulsion of magnetic field lines due to the Meissner effect in a superconductor results in a clear drop of the magnetic field in the close vicinity of the sample, where the NV sensors are located. This detection provides an unambiguous diagnosis of superconductivity that does not rely on questionable electrical contacts or indirect probes once implemented at high pressure. This procedure can be performed on any magnetic sample and is compatible with synchrotron X-ray diffraction for structural characterization. Finally, we demonstrate that NV micro-sensing can be implemented above 100 GPa by machining a micropillar on the anvil tip to create a quasi-hydrostatic stress environment for the NV centers. This result increases the pressure range of NV micro-sensing. It enables the undisputable detection of the Meissner effect of super-hydrides that is currently under stifling debate.
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Dates et versions

hal-04443640 , version 1 (07-02-2024)

Identifiants

  • HAL Id : hal-04443640 , version 1

Citer

Marie-Pierre Adam, Cassandra Dailledouze, Antoine Hilberer, Loïc Toraille, Liam Hanlon, et al.. Quantum diamond magnetometry for high pressure sensing. 20th International Conference on Luminescence, Aug 2023, Paris, France. ⟨hal-04443640⟩
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