Is superconductivity in MnB₄ due to altermagnetic spin fluctuations?

Recent high-pressure experimental measurements of superconductivity in nonmagnetic P2₁/c MnB₄ indicated unusually high critical temperature of 14.2 K at 158 GPa. Ab initio calculations of electron-phonon coupling predict critical temperature of only below 1 K and cannot explain this phenomenon with conventional superconductivity, due to low electronic density of states at the Fermi level. We find that MnB₄ is close to altermagnetic instability, which would make it the first superconductor with pairing due to altermagnetic spin fluctuations on Mn atoms. We also present a minimal tight-binding model that could effectively explain the origin of superconductivity in MnB₄.