Magnetic measurements under high-pressure conditions are pivotal for the study of superconductivity and magnetic materials but remain challenging due to the micrometer-sized sample in diamond anvil cells (DAC). In this study, we propose a quantum sensing approach utilizing negatively charged boron-vacancy (VB−) spin defects in two-dimensional hexagonal boron nitride for high resolution magnetic measurements under pressure. The optical and spin properties of VB− defects were systematically studied under high-pressure conditions, revealing a significant pressure-induced shift in zero-field splitting (ZFS), approximately three times larger than that of nitrogen-vacancy (NV) center. Furthermore, we demonstrate the pressure-dependent magnetic transition and variations in the Curie temperature of van der Waals ferromagnet Fe3GeTe2 flake using VB− defects under pressures. Notably, the maximum operational pressure for VB− defects was determined to be approximately 11 GPa, attributed to a structural phase transition in hexagonal boron nitride (hBN). This work establishes the way for two-dimensional quantum sensing technologies under high-pressure environments.
@article{arxiv.2501.13757,
title = {Magnetic measurements under high pressure with a quantum sensor in Hexagonal Boron Nitride},
author = {Lun-Xuan Yu and Nai-Jie Guo and Lin Liu and Wei Liu and Gui-Zhen Yan and Jin-Ming Cui and Jian-Shun Tang and Chuan-Feng Li and Xiao-Di Liu},
journal= {arXiv preprint arXiv:2501.13757},
year = {2025}
}