Pressure Tuned 2D Superconductivity in Black Phosphorus

TL;DR

This study explores how applying pressure to black phosphorus induces superconductivity, revealing phase transitions and dimensional characteristics, with potential implications for understanding layered superconductors.

Contribution

It provides new insights into pressure-induced superconductivity in black phosphorus and characterizes its phase-dependent dimensionality and critical fields.

Findings

Superconductivity appears above 5.0 GPa pressure.

A7 phase exhibits two-dimensional superconducting behavior.

A17 and cubic phases are three-dimensional.

Abstract

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.