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Magnetic order and multipoles in the 5d2 rhenium double perovskite Ba2YReO6

Authors :
Casey Marjerisson
Gøran J. Nilsen
John E. Greedan
Danis I. Badrtdinov
A. A. Tsirlin
Corey M. Thompson
Source :
Physical Review B. 103
Publication Year :
2021
Publisher :
American Physical Society (APS), 2021.

Abstract

${\mathrm{Ba}}_{2}\mathrm{Y}\mathrm{Re}{\mathrm{O}}_{6}$ is a double perovskite material where the ${\mathrm{Re}}^{5+}$ (${d}^{2}$) ions occupy a frustrated face-centered cubic lattice. Despite strong antiferromagnetic interactions between the Re ions, as indicated by a large negative Weiss constant $\ensuremath{\theta}=\ensuremath{-}616$ K, spin freezing in ${\mathrm{Ba}}_{2}\mathrm{Y}\mathrm{Re}{\mathrm{O}}_{6}$ only occurs at 45 K. Since no long-range order of magnetic dipoles has previously been found in either muon spin rotation or neutron diffraction experiments below this temperature, it has been assumed that the low-temperature state is a spin glass. In stark contrast with these findings, we here show that ${\mathrm{Ba}}_{2}\mathrm{Y}\mathrm{Re}{\mathrm{O}}_{6}$ does in fact order with a strongly reduced dipole moment ${\ensuremath{\mu}}_{0}=0.29--0.42\phantom{\rule{0.28em}{0ex}}{\ensuremath{\mu}}_{B}$ via a polarized neutron diffraction experiment on a powder sample. Using the symmetries of the two likeliest magnetic structures and the properties of the $5{d}^{2}$ configuration in the presence of strong spin-orbit coupling and strong crystal fields, we use a recently derived single-ion wave function for ${\mathrm{Re}}^{5+}$ to predict a large quadrupolar moment based on the experimental ${\ensuremath{\mu}}_{o}$.

Details

ISSN :
24699969 and 24699950
Volume :
103
Database :
OpenAIRE
Journal :
Physical Review B
Accession number :
edsair.doi...........1775b532604b305e3435baa8226722c1
Full Text :
https://doi.org/10.1103/physrevb.103.104430