Abstract
We investigate the crystal structure, magnetic properties, and crystalline electric field of tetragonal, . In this compound, ions form a tetragonally elongated diamond lattice coupled by antiferromagnetic interactions ( K) that magnetically order below K. The crystalline electric field-split multiplet is studied via inelastic neutron scattering to parametrize a ground state doublet composed of states possessing mixed character. Neutron powder diffraction data reveal the onset of -type antiferromagnetism with moments aligned along the axis. The magnetic structure is consistent with the expectations of a frustrated Heisenberg model on the elongated diamond lattice with effective exchange values and .
- Received 26 October 2020
- Accepted 4 January 2021
DOI:https://doi.org/10.1103/PhysRevB.103.024430
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