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Recent investigations into MoB$_{2}$ have unveiled a direct connectionbetween a pressure-induced structural transition to a P6/mmm space groupstructure and the emergence of superconductivity, producing criticaltemperatures up to 32 K at 100 GPa. This pressure-induced superconducting stateunderscores the potential of doped MoB$_{2}$ as a possible candidate formetastable superconductivity at ambient pressure. In this work, we demonstratethat doping by Zr, Hf, or Ta stabilizes the P6/mmm structure at ambientpressure and results in the realization of a superconducting state withcritical temperatures ranging from 2.4 up to 8.5 K depending on the specificdoping. We estimate the electron-phonon coupling $\lambda$ and the density ofstates based on resistivity and specific heat data, finding that $\lambda$ranges from 0.4 - 0.6 for these compounds. Finally, to investigate the role ofpossible metastable defect structures on the critical temperature, we analyzeMoB$_{2}$, MoB$_{2.5}$, and Nb/Zr-doped MoB$_{2}$ using rapid coolingtechniques. Notably, splat-quenching produces samples with higher criticaltemperatures and even retains superconductivity in MoB$_{2}$ at ambientpressure, achieving a critical temperature of 4.5 K.

Diboride compounds doped with transition metals$\unicode{x2013}$a route to superconductivity through structure stabilization as well as defects