  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.
