This paper examines the micro-parameters of superconductors. It studies the modulations from weak van der Waals interaction to strong covalence bonding of superconductors. In particular, we studied layered black phosphorus (BP) as a function of pressure. These results reveal a rich scenario of phase transitions and related quantum phenomena, which show that the phases exhibit superconducting states at a pressure higher than 5.0 GPa. In addition, they indicate an angle-dependent upper critical field that demonstrates the dimensional characteristics of superconductivities. This result suggests that the A17 and cubic phases are three-dimensional (3D). The A7 phase shows a two-dimensional (2D) character. The 2D behavior is related to a weakened, distorted, entangled interlayer coupling.
@article{arxiv.2307.08385,
title = {Pressure Tuned 2D Superconductivity in Black Phosphorus},
author = {Meiling Jin and Qing Wang and Ying Liu and Qunfei Zheng and Chenkai Li and Shaoheng Wang and Shanmin Wang and Ning Hao and Yuki Nakamoto and Katsuya Shimizu and Jinlong Zhu},
journal= {arXiv preprint arXiv:2307.08385},
year = {2023}
}