Biomaterial Database

Magnetic detection under high pressures using designed silicon vacancy centres in silicon carbide. 2023

Jun-Feng Wang, and Lin Liu, and Xiao-Di Liu, and Qiang Li, and Jin-Ming Cui, and Di-Fan Zhou, and Ji-Yang Zhou, and Yu Wei, and Hai-An Xu, and Wan Xu, and Wu-Xi Lin, and Jin-Wei Yan, and Zhen-Xuan He, and Zheng-Hao Liu, and Zhi-He Hao, and Hai-Ou Li, and Wen Liu, and Jin-Shi Xu, and Eugene Gregoryanz, and Chuan-Feng Li, and Guang-Can Guo

CAS Key Laboratory of Quantum Information, University of Science and Technology of China, Hefei, China.

Pressure-induced magnetic phase transitions are attracting interest as a means to detect superconducting behaviour at high pressures in diamond anvil cells, but determining the local magnetic properties of samples is a challenge due to the small volumes of sample chambers. Optically detected magnetic resonance of nitrogen vacancy centres in diamond has recently been used for the in situ detection of pressure-induced phase transitions. However, owing to their four orientation axes and temperature-dependent zero-field splitting, interpreting these optically detected magnetic resonance spectra remains challenging. Here we study the optical and spin properties of implanted silicon vacancy defects in 4H-silicon carbide that exhibit single-axis and temperature-independent zero-field splitting. Using this technique, we observe the magnetic phase transition of Nd2Fe14B at about 7 GPa and map the critical temperature-pressure phase diagram of the superconductor YBa2Cu3O6.6. These results highlight the potential of silicon vacancy-based quantum sensors for in situ magnetic detection at high pressures.