All-Optical Low-Field Magnetometry of Superconductors Using NV Nanodiamonds

Abstract: 
We report a microwave-free, all-optical approach for probing superconductivity using near-zero-
field cross-relaxation magnetometry with nitrogen-vacancy (NV) centers in nanodiamonds. By de-
positing nanodiamonds on a 200 nm YBa2Cu3O7−δ thin film, we observe superconducting prop-
erties locally via magnetic-field-induced changes in NV fluorescence. A modulated magnetic field
of (≈1 mT) reveals the Meissner effect and allows determination of the superconducting transition
temperature, while field-dependent measurements identify the magnetic penetration field. This min-
imally invasive, all-optical approach offers a general platform for studying local magnetic responses
and collective phenomena of various superconducting materials under near-zero-field conditions.
 
 
doi: https://doi.org/10.1016/j.measurement.2026.122080 
Autorzy / Authors: 
O. Dhungel, S. Sengottuvel, M. Mrózek, T. Lenz, N. Bar-Gill, A. M. Wojciechowski, A. Wickenbrock, and D. Budker
Czasopismo: 
Measurement, 283, 122080
Rok: 
2026
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Tematyka badań: 
Magnetometria
Zastosowania
Spektroskopia laserowa
Inna tematyka