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High-temperature superconductivity has been observed in binary hydrides suchas LaH10 at pressures above 150 GPa. Hydrogen cage structures have beenidentified as a common motif beneficial for high critical temperatures Tc.Efforts are now focused on finding hydride high-temperature superconductors atlower pressures. We present evidence for high-temperature superconductivity inbinary La4H23 with A15-type structure featuring hydrogen cages at a pressure ofP = 95 GPa. We synthesise La4H23 from a lanthanum film capped with a palladiumcatalyst promoting the dissociation of hydrogen. In resistance measurements, weobserve superconductivity with a transition temperature Tc = 90 K. In X-raydiffraction on the same sample, we identify the A15-type cubic body centredstructure of the lanthanum sublattice. From comparison with earlier XRD andstructure prediction studies, we identify this phase with La4H23. Our studyreinforces the concept of hydrogen cages for high-temperaturesuperconductivity.

High-temperature superconductivity in A15-type La4H23 below 100 GPa