Quadrupolar and dipolar magnetic order inDyPd3S4: A neutron scattering and muon spin rotation and relaxation investigation

Abstract

The quadrupolar and dipolar magnetic phases in polycrystalline ${\mathrm{DyPd}}_{3}{\mathrm{S}}_{4}$ have been investigated by neutron scattering and muon spin rotation/relaxation $(\ensuremath{\mu}\mathrm{SR})$ technique. The transition from paramagnetic to antiferroquadrupolar state at ${T}_{Q}=3.4\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ as well as two successive dipolar magnetic phase transitions at ${T}_{N1}\ensuremath{\approx}1\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ and ${T}_{N2}\ensuremath{\approx}0.8\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ are evidenced by anomalies in the observed relaxation rates in the zero-field $\ensuremath{\mu}\mathrm{SR}$ measurements. In addition, measurements in longitudinal external magnetic field showed clear evidence for field-induced dipolar magnetic moments below ${T}_{Q}$. In inelastic neutron scattering measurements the transition to an ordered lattice of the Dy quadrupole moments at ${T}_{Q}$ is observed by a temperature dependent splitting of the ground-state crystal-field multiplet below ${T}_{Q}$. Neutron diffraction revealed the induced magnetic structure in the quadrupolar phase of ${\mathrm{DyPd}}_{3}{\mathrm{S}}_{4}$ to be of the canted antiferromagnetic type with a canting angle close to perpendicular, similar to the spontaneous zero-field magnetic structures below $1\phantom{\rule{0.3em}{0ex}}\mathrm{K}$.