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Communication Dans Un Congrès Année : 2023

Quantum diamond magnetometry for high-pressure sensing

Résumé

High-pressure magnetometry can be implemented using nitrogen-vacancy (NV) colour centres in diamond. These atomic-like quantum systems can be fabricated at the tip of diamond anvils using nitrogen ion implantation. Due to their spin properties, NV centres are highly sensitive magnetic probes, and their atomic size can allow for sub-micrometer spatial resolution. Using a customised optical microscope, we observe the spin dependent luminescence of NV centres, 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 leads to a decrease of the magnetic field amplitude in the close vicinity of the sample, where the NV sensors are located. This detection provides a direct and reproducible diagnosis of superconductivity that can be easily combined with synchrotron X-ray diffraction for structural characterization. The challenge is to deploy this method at pressures above 100 GPa, in order for instance to probe the superconductivity of super-hydrides. All previous experiments reported a decrease of pressure of the NV sensitivity to the magnetic field, setting a practical limit at about 50 GPa. We found that this limit is due to the cupping of the diamond tip induced by the huge forces exerted on the anvils. The stress anisotropy then breaks the NV symmetry, and its magnetic sensitivity is blurred out. The sensitivity can be restored by ensuring hydrostatic compression. This regime can be obtained by milling a micropillar on the anvil tip. For the NV centers on the surface of the micropillar the Zeeman splitting created by an applied magnetic field is then the same at 130 GPa than at 20 GPa. This result significantly extends the pressure range where NV magnetic sensing and derived quantum sensing techniques can be efficiently implemented.
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Dates et versions

hal-04443682 , version 1 (07-02-2024)

Identifiants

  • HAL Id : hal-04443682 , version 1

Citer

Jean-François Roch, Antoine Hilberer, Loïc Toraille, Cassandra Dailledouze, Liam Hanlon, et al.. Quantum diamond magnetometry for high-pressure sensing. 28th AIRAPT and 60th EHPRG, Jul 2023, Edimbourg (Ecosse), United Kingdom. ⟨hal-04443682⟩
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