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Boron-based clathrate materials, typically with three-dimensional networks ofB atoms, have tunable properties through substitution of guest atoms, but thetuning of B cages themselves has not yet been developed. By combining crystalstructural search with the laser-heated diamond anvil cell technique, wesuccessfully synthesized a new B-based clathrate boride, LaB8, at ~108 GPa and~2100 K. The novel structure has a B-richest cage, with 26 B atomsencapsulating a single La atom. LaB8 demonstrates phonon-mediatedsuperconductivity with an estimated transition temperature of 14 K at ambientpressure, mainly originating from electron-phonon coupling of B cage. This workcreates a prototype platform for subsequent investigation on tunable electronicproperties through the choice of captured atoms.

Design and Synthesis of Clathrate LaB8 with Superconductivity