Abstract
We report neutron scattering measurements of the spinel oxide , in which magnetic ions form a breathing pyrochlore lattice. Our experiments reveal the coexistence of a nearly dispersionless resonance mode and dispersive spin-wave excitations in the magnetically ordered state, which can be quantitatively described by a quantum spin model of hexagonal loops and linear spin-wave theory with the same set of exchange parameters, respectively. Comparison to other Cr spinel oxides reveals a linear relationship between the resonance energy and lattice constant across all these materials, which is in agreement with our hexagonal loop calculations. Our results suggest a unified picture for spin resonances in Cr spinel oxides.
| Original language | English |
|---|---|
| Article number | 147205 |
| Journal | Physical Review Letters |
| Volume | 127 |
| Issue number | 14 |
| DOIs | |
| State | Published - Oct 1 2021 |
| Externally published | Yes |
Funding
Ministry of Science and Technology of the People’s Republic of China Shanghai Municipal Education Commission Science and Technology Commission of Shanghai Municipality National Natural Science Foundation of China This work was partially supported by the National Key R&D Program of the MOST of China (Grant No. 2016YFA0300203), the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017-01-07-00-07-E00018), the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01), and the National Natural Science Foundation of China (Grant No. 11874119).