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Role of crystal-field ground state in the classical spin-liquid behavior of the quasi-one-dimensional spin-chain system <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">NiPtO</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:math>
The spin-chain compound ${\mathrm{Sr}}_{3}{\mathrm{NiPtO}}_{6}$ is known to have a nonmagnetic ground state. We investigate the nature of the ground state of ${\mathrm{Sr}}_{3}{\mathrm{NiPtO}}_{6}$ using the magnetic susceptibility $\ensuremath{\chi}(T)$, heat capacity ${C}_{\mathrm{p}}(T)$, muon spin relaxation ($\ensuremath{\mu}\mathrm{SR}$), and inelastic neutron scattering (INS) measurements. $\ensuremath{\chi}(T)$ and ${C}_{\mathrm{p}}(T)$ do not exhibit any pronounced anomaly that …