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Metal borides have been considered as potential high-temperaturesuperconductors since the discovery of record-holding 39 K superconductivity inbulk MgB2. In this work, we identified a superconducting yet thermodynamicallystable F43m Sr2B5 at 40 GPa with a unique covalent sp3-hybridized boronframework through extensive first-principles structure searches. Remarkably,solving the anisotropic Migdal-Eliashberg equations resulted in a highsuperconducting critical temperature (Tc) around 100 K, exceeding the boilingpoint (77 K) of liquid nitrogen. Our in-depth analysis revealed that thehigh-temperature superconductivity mainly originates from the strong couplingbetween the metalized {\sigma}-bonded electronic bands and E phonon modes ofboron atoms. Moreover, anharmonic phonon simulations suggest that F43m Sr2B5might be recovered to ambient pressure. Our current findings provide aprototype structure with a full {\sigma}-bonded boron framework for the designof high-Tc superconducting borides that may expand to a broader variety oflightweight compounds.

Prediction of fully metallic {\sigma}-bonded boron framework induced high superconductivity above 100 K in thermodynamically stable Sr2B5 at 40 GPa