  Our single-crystal polarized neutron scattering at 65 mK and powder
unpolarized neutron diffraction at 0.5 K show no evidence for a long-range
magnetic order and even detect no sign of diffuse magnetic neutron scattering
in single-crystal SrTm2O4. The data refinements reveal that the two TmO6
octahedral distortion modes are the same as those of the TbO6 octahedra in
SrTb2O4, i.e., one distortion is stronger than the other one especially at low
temperatures, which is attributed probably to different crystal electric fields
for the two inequivalent octahedra. Consequently, we conclude that SrTm2O4 has
no 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 family
of frustrated SrRE2O4 (RE = Gd, Tb, Dy, Ho, Er, and Yb) magnets. We propose
that crystal field anisotropy may dominate over weak dipolar spin interactions
in SrTm2O4, leading to a virtually nonmagnetic ordering state.
