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Our single-crystal polarized neutron scattering at 65 mK and powderunpolarized neutron diffraction at 0.5 K show no evidence for a long-rangemagnetic order and even detect no sign of diffuse magnetic neutron scatteringin single-crystal SrTm2O4. The data refinements reveal that the two TmO6octahedral distortion modes are the same as those of the TbO6 octahedra inSrTb2O4, i.e., one distortion is stronger than the other one especially at lowtemperatures, which is attributed probably to different crystal electric fieldsfor the two inequivalent octahedra. Consequently, we conclude that SrTm2O4 hasno magnetic order, neither long-ranged nor short-ranged, even down to 65 mK.Therefore, SrTm2O4 is a different compound from its brethren in the new familyof frustrated SrRE2O4 (RE = Gd, Tb, Dy, Ho, Er, and Yb) magnets. We proposethat crystal field anisotropy may dominate over weak dipolar spin interactionsin SrTm2O4, leading to a virtually nonmagnetic ordering state.

Nonmagnetic ordering state of single-crystal SrTm$_2$O$_4$: A polarized and unpolarized neutron-scattering study