Abstract
Double perovskites containing heavy transition-metal ions are an important family of compounds for the study of the interplay between electron correlation and spin-orbit coupling. Here, by combining magnetic susceptibility, heat capacity, and neutron scattering measurements, we investigate the dipolar and quadrupolar correlations in two prototypal rhenium-based double perovskite compounds Ba2YReO6 and Ba2ScReO6. A type-I dipolar antiferromagnetic ground state with a propagation vector q = (0,0,1) is observed in both compounds. At temperatures above the magnetic transitions, a quadrupolar ordered phase is identified. Weak spin excitations, which are gapped at low temperatures and softened in the correlated paramagnetic phase, are explained using a minimal model that considers both the dipolar and quadrupolar interactions. At larger wave vectors, we observe dominant phonon excitations that are well described by density functional calculations.
| Original language | English |
|---|---|
| Pages (from-to) | 1-12 |
| Number of pages | 12 |
| Journal | Physical Review B |
| Volume | 112 |
| Issue number | 7 |
| DOIs | |
| State | Published - Aug 4 2025 |
Funding
This work was supported by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, Materials Sciences and Engineering Division (Neutron scattering data collection and initial analysis). This research used resources at the Spallation Neutron Source and the High Flux Isotope Re- actor, both of which are DOE Office of Science User Facilities operated by the Oak Ridge National Laboratory. The beam time was allocated to POWGEN on Proposal No. IPTS-27345, to SEQUOIA on Proposal No. IPTS-26621, and to HB-1A on Proposal No. IPTS-26600. Work at USTC was funded by the National Key Research and Development Program of China under Grant No. 2024YFA1613100 and the National Natural Science Foundation of China under Grant No. 12374152. This work was also supported by the Japan Society for the Promotion of Science KAKENHI under Grants No. JP20H01858, No. JP23H04860, and No. JP24H01187 and the JSPS Bilateral Open Partnership Joint Research Project No. JPJSBP120239915.