Investigation of the exotic low temperature groundstate of the S_eff=1/2 pyrochlore antiferromagnet Ce2Sn2O7
We have recently discovered an exotic magnetic state developing at subKelvin temperatures in the Ce3+ pyrochlore stannate. The spin system of this compound is characterized by a thermally isolated Jz=1/2 Kramers' doublet at low temperature, providing effective spin 1/2 moments on a pyrochlore lattice. We have observed that these spins are characterized by a strong Ising <111> anisotropy. The system does not order down to the lowest investigated temperature (70 mK). However, it develops a correlated regime for temperatures below 1 K, due to antiferromagnetic interactions one order of magnitude larger than the expected ferromagnetic dipolar couplings. We would like to characterize this low temperature phase using XYZ polarization analysis on D7 using a powder sample. We will be able to efficiently separate the magnetic signal from non-magnetic contamination, which is particularly important since we will require ultra-low temperature sample environment, which increases background, and because the magnetic signal is inherently weak (Seff=1/2).
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Romain Sibille; FENNELL Tom; KENZELMANN Michel; LHOTEL Elsa and NILSEN Goran. (2015). Investigation of the exotic low temperature groundstate of the S_eff=1/2 pyrochlore antiferromagnet Ce2Sn2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-32-809
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