Candidate Quantum Spin Liquid in the Ce³⁺ Pyrochlore Stannate Ce₂Sn₂O₇

We report the low-temperature magnetic properties of Ce₂Sn₂O₇, a rare-earth pyrochlore. Our suscep- tibility and magnetization measurements show that due to the thermal isolation of a Kramers doublet ground state, Ce₂Sn₂O₇ has Ising-like magnetic moments of ∼1.18 μ_B. The magnetic moments are confined to the local trigonal axes, as in a spin ice, but the exchange interactions are antiferromagnetic. Below 1 K, the system enters a regime with antiferromagnetic correlations. In contrast to predictions for classical -Ising spins on the pyrochlore lattice, there is no sign of long-range ordering down to 0.02 K. Our results suggest that Ce₂Sn₂O₇ features an antiferromagnetic liquid ground state with strong quantum fluctuations.