Abstract
The isostructural series of S=1 quantum magnets Cs1-xRbxFeCl3 is investigated, using both thermodynamic measurements and inelastic neutron scattering experiments. It is found that with increasing Rb content the system evolves from the gapped state at x=0, through a quantum phase transition at x∼0.35, and to the magnetically ordered state at larger x. Inelastic neutron experiments for x=0, x=0.3, and x=1 demonstrate that the magnetic anisotropy and spin interactions are continuously tuned by the chemical composition. For the intermediate concentration all magnetic excitations are substantially broadened suggesting that disorder plays a key role in this species. For the two end compounds, excitations remain sharp.
| Original language | English |
|---|---|
| Article number | 224420 |
| Journal | Physical Review B |
| Volume | 99 |
| Issue number | 22 |
| DOIs | |
| State | Published - Jun 17 2019 |
Funding
This work was supported by Swiss National Science Foundation under Division 2. We thank Dr. K. Yu. Povarov (ETH Zürich) for assistance with the thermodynamics measurements and for fruitful discussion. The neutron scattering experiment at the CNCS used resources at the Spallation Neutron Source, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory (IPTS-21713.1).