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Metallization of quantum spin liquid (QSL) materials has long been consideredas a potential route to achieve unconventional superconductivity. Here wereport our endeavor in this direction by pressurizing a three-dimensional QSLcandidate, LiYbSe$_2$, with a previously unreported pyrochlore structure.High-pressure X-ray diffraction and Raman studies up to 50 GPa reveal noappreciable changes of structural symmetry or distortion in this pressurerange. This compound is so insulating that its resistance decreases below10$^5$ ${\Omega}$ only at pressures above 25 GPa in the correspondingtemperature range accompanying the gradual reduction of band gap uponcompression. Interestingly, an insulator-to-metal transition takes place inLiYbSe$_2$ at about 68 GPa and the metallic behavior remains up to 123.5 GPa,the highest pressure reached in the present study. A possible sign of magneticor other phase transition was observed in LiYbSe$_2$. The insulator-to-metaltransition in LiYbSe$_2$ under high pressure makes it an ideal system to studythe pressure effects on QSL candidates of spin-1/2 Yb$^{3+}$ system indifferent lattice patterns.

Insulator to Metal Transition, Spin-Phonon Coupling, and Potential  Magnetic Transition Observed in Quantum Spin Liquid Candidate LiYbSe$_2$  under High Pressure