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Pressure-induced magnetic phase transition is attracting interest due to itsability to detect superconducting behaviour at high pressures in diamond anvilcells. However, detection of the local sample magnetic properties is a greatchallenge due to the small sample chamber volume. Recently, optically detectedmagnetic resonance (ODMR) of nitrogen vacancy (NV) centers in diamond have beenused for in-situ pressure-induced phase transition detection. However, owing totheir four orientation axes and temperature-dependent zero-field-splitting,interpreting the observed ODMR spectra of NV centers remain challenging. Here,we study the optical and spin properties of implanted silicon vacancy defectsin 4H-SiC, which is single-axis and temperature-independentzero-field-splitting. Using this technique, we observe the magnetic phasetransition of Nd2Fe14B at about 7 GPa and map the critical temperature-pressurephase diagram of the superconductor YBa2Cu3O6.6. These results highlight thepotential of silicon vacancy-based quantum sensors for in-situ magneticdetection at high pressures.

Magnetic detection under high pressures using designed silicon vacancy centers in silicon carbide