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The effects of pressure on a quantum spin liquid are investigated in anorganic Mott insulator $\kappa$-(ET)$_2$Ag$_2$(CN)$_3$ with a spin-1/2triangular lattice. The application of negative chemical pressure to$\kappa$-(ET)$_2$Cu$_2$(CN)$_3$, which is a well-known sister Mott insulator,allows for extensive tuning of antiferromagnetic exchange coupling, with$J/k_{\rm B} = 175 - 310$ K, under hydrostatic pressure. Based on $^{13}$Cnuclear magnetic resonance measurements under pressure, we uncover universalscaling in the static and dynamic spin susceptibilities down to lowtemperatures $\sim 0.1k_{\rm B}T/J$. The persistent fluctuations and residualspecific heat coefficient are consistent with the presence of gapless low-lyingexcitations. Our results thus demonstrate fundamental finite-temperatureproperties of quantum spin liquid in a wide parameter range.

Pressure-Tuned Exchange Coupling of a Quantum Spin Liquid in the Molecular Triangular Lattice $\kappa$-(ET)$_2$Ag$_2$(CN)$_3$