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Single-crystal x-ray diffraction, density-functional band-structurecalculations, and muon spin relaxation ($\mu$SR) are used to probe pressureevolution of the triangular spin-liquid candidate YbMgGaO$_4$. The rhombohedralcrystal structure is retained up to at least 10 GPa and shows a nearly uniformcompression along both in-plane and out-of-plane directions, whereas localdistortions caused by the random distribution of Mg$^{2+}$ and Ga$^{3+}$ remainmostly unchanged. The $\mu$SR data confirm persistent spin dynamics up to 2.6GPa and down to 250 mK with no change in the muon relaxation rate.Longitudinal-field $\mu$SR reveals power-law behavior of the spin-spinautocorrelation function, both at ambient pressure and upon compression.

Persistent spin dynamics in the pressurized spin-liquid candidate YbMgGaO$_4$