Superconductivity in ZrB₁₂ under High Pressure

Transition metal borides have emerged as pivotal players in various fields. In addition to their exceptional properties such as high hardness, a high melting point, and corrosion resistance, certain compounds exhibit remarkable characteristics including superconductivity, magnetism, electrical conductivity, and catalytic activity. Among these compounds, ZrB₁₂ has garnered significant attention due to its unique physicochemical properties. However, previous research on ZrB₁₂ has predominantly focused on its mechanical behavior while overlooking the electron-electron interactions of the superconducting state. In this paper, resistance characterization of ZrB₁₂ under high-pressure conditions was conducted to further investigate its superconductivity. Our research findings indicate that ZrB₁₂ maintains its superconductivity within a pressure range of 0 to 1.5 GPa and is classified as a type 2 superconductor. Additionally, the results confirm the anisotropic nature of ZrB₁₂’s superconductivity. As the pressure increases, the superconducting transition temperature undergoes a gradual decrease. Remarkably, ZrB₁₂ exhibits metallic behavior under pressures up to 31.4 GPa. The observed decline in superconductivity in ZrB₁₂ can be ascribed to the intensified influence of Zr’s movement on phonon dispersion, ultimately leading to a reduction in carrier concentration.