期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.097202
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资金
- European Community's Seventh Framework Programme [290605, 228464]
- Swiss National Science Foundation [200021_140862, 200021_138018]
- Swiss National Science Foundation (SNF) [200021_138018, 200021_140862] Funding Source: Swiss National Science Foundation (SNF)
We report the low-temperature magnetic properties of Ce2Sn2O7, a rare-earth pyrochlore. Our susceptibility and magnetization measurements show that due to the thermal isolation of a Kramers doublet ground state, Ce2Sn2O7 has Ising-like magnetic moments of similar to 1.18 mu(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 < 111 >-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.
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