2017/10/02 by P. Dalmas de Réotier, P. Dalmas de Reotier, C. Marin +10 · 19 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Condensed matter physics #Crystal Structures and Properties #Diffraction #Magnetic and transport properties of perovskites and related materials #Magnetic moment #Magnetic susceptibility #Muon spin spectroscopy #Neutron diffraction #Paramagnetism #Physics #Pyrochlore #Quantum mechanics #Spin glass #Spins #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.96.134403
published in Physical review. B./Physical review. B 96(13) (American Physical Society) · 11 pages, 14 figures, 2 tables, among which a list of the magnetic space groups of frustrated magnets on the pyrochlore lattice with null propagation wavevectors
openalex publication_date 2017/10/02 · arxiv created 2017/10/03 · arxiv updated 2017/10/05 · openalex created_date 2017/10/20 · openalex updated_date 2026/08/06
Magnetic systems with spins sitting on a lattice of corner sharing regular tetrahedra have been particularly prolific for the discovery of new magnetic states for the last two decades. The pyrochlore compounds have offered the playground for these studies, while little attention has been comparatively devoted to other compounds where the rare earth R occupies the same sublattice, e.g., the spinel chalcogenides CdR2X4 (X=S or Se). Here, we report measurements performed on powder samples of this series with R=Yb using specific heat, magnetic susceptibility, neutron diffraction, and muon-spin-relaxation measurements. The two compounds are found to be magnetically similar. They long-range order into structures described by the \mathrm\ensuremathΓ5 irreducible representation. The magnitude of the magnetic moment at low temperature is 0.77 (1) and 0.62 (1) \ensuremathμB for X=S and Se, respectively. Persistent spin dynamics is present in the ordered states. The spontaneous field at the muon site is anomalously small, suggesting magnetic moment fragmentation. A double spin-flip tunneling relaxation mechanism is suggested in the cooperative paramagnetic state up to 10 K. The magnetic space groups into which magnetic moments of systems of corner-sharing regular tetrahedra order are provided for a number of insulating compounds characterized by null propagation wave vectors.