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An important feature of strong correlated electron systems is the tunabilitybetween interesting ground states such as unconventional superconductivity andexotic magnetism. Pressure is a clean, continuous and systematic tuningparameter. However, due to the restricted accessibility introduced byhigh-pressure devices, compatible magnetic field sensors with sufficientsensitivity are rare. This greatly limits the detections and detailed studiesof pressure-induced phenomena. Here, we utilize nitrogen vacancy (NV) centersin diamond as a powerful, spatially-resolved vector field sensor for materialresearch under pressure at cryogenic temperatures. Using a single crystal ofBaFe2(As0:59P0:41)2 as an example, we extract the superconducting transitiontemperature (Tc), the local magnetic field profile in the Meissner state andthe critical fields (Hc1 and Hc2). The method developed in this work willbecome a unique tool for tuning, probing and understanding quantum many bodysystems.

Quantum sensing of local magnetic field texture in strongly correlated electron systems under extreme conditions