Abstract
CaCo2−yAs2 is an unusual itinerant magnet with signatures of extreme magnetic frustration. The conditions for establishing magnetic order in such itinerant frustrated magnets, either by reducing frustration or increasing electronic correlations, is an open question. Here, we use results from inelastic neutron scattering and magnetic susceptibility measurements and density functional theory calculations to show that hole doping in Ca(Co1−xFex)2−yAs2 suppresses magnetic order by quenching the magnetic moment while maintaining the same level of magnetic frustration. The suppression is due to tuning the Fermi energy away from a peak in the electronic density of states originating from a flat conduction band. This results in the complete elimination of the magnetic moment by x≈0.25, providing a clear example of a Stoner-type transition.
| Original language | English |
|---|---|
| Article number | L220410 |
| Journal | Physical Review B |
| Volume | 104 |
| Issue number | 22 |
| DOIs | |
| State | Published - Dec 1 2021 |
| Externally published | Yes |
Funding
We are grateful for conversations with H. C. Walker, A. I. Goldman, A. Kreyssig, P. P. Orth, and D. Vaknin, and to D. L. Schlagel for assistance with coaligning single crystals. Work at the Ames Laboratory was supported by the U.S. Department of Energy (DOE), Basic Energy Sciences, Division of Materials Sciences & Engineering, under Contract No. DE-AC02-07CH11358. Experiments at the ISIS Neutron and Muon Source were supported by a beamtime allocation RB1810596 from the Science and Technology Facilities Council.