<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>T</mml:mi><mml:mi>c</mml:mi></mml:msub></mml:math> up to 23.6 K and robust superconductivity in the transition metal <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>δ</mml:mi><mml:mtext>−</mml:mtext><mml:mi>Ti</mml:mi></mml:math> phase at megabar pressure

We report a record high superconducting transition temperature ($T_{\rm c}$) up to 23.6 K under pressure in the elemental metal Ti, one of top ten most abundant elements Earth's crust. The $T_{\rm c}$ increases monotonically from 2.3 at 40.3 GPa 144.9 GPa, which surpasses all known records metals reported so far. With further compression, robust ~23 is observed between and 183 $\delta$-Ti phase. pressure-dependent can be well described by conventional electron-phonon coupling (EPC) mechanism. Density Functional Theory calculations show Fermi nesting phonon softening optical branches $\gamma$-Ti phase enhance EPC, results c}$. attribute superconductivity apparent robustness its strong EPC against lattice compression. These provide new insight into exploring high-$T_{\rm Ti-based alloys.