Abstract
The magnetic properties of the hyperkagome system of ${\text{Tb}}_{3}{\text{Ga}}_{5}{\text{O}}_{12}$ have been investigated by neutron scattering. Evidence of antiferromagnetic long-range order of the Tb moments at ${\text{T}}_{N}\ensuremath{\le}0.35\text{ }\text{K}$ in zero field is provided. With the application of magnetic field in the paramagnetic phase, ferromagnetic peaks initially appear at nuclear Bragg reflections. With the field higher than 3 Tesla, antiferromagnetic Bragg peaks appear as well indicating that the low-temperature magnetic phase extends well beyond the phase boundary, into the paramagnetic phase, with field. The new magnetic symmetry sets in at the metamagnetic transition in this system.
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