Cell + Ionic relaxation with Orb v3 conservative inf MPA; 0.03 eV/Å threshold; final energy = -49.3055 eV; energy change = -11.5439 eV; symmetry: Im-3m → Im-3m
YH6 in Im-3m symmetry at 150 GPa, from Belli, Zurek & Errea (npj Comput. Mater. 2026). SB class: QNEs suppress Tc (272 to 247 K).