Temperature dependence of magnetic excitations in the frustrated antiferromagnetic spinel ZnMn2O
- Authors
- Chang, Hun; Hwang, In-Yong; Chung, Jae-Ho; Stewart, J. Ross; Higemoto, Wataru; Miyake, Yasuhiro
- Issue Date
- 3-1월-2018
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW B, v.97, no.1
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW B
- Volume
- 97
- Number
- 1
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/78009
- DOI
- 10.1103/PhysRevB.97.014406
- ISSN
- 2469-9950
- Abstract
- We report the temperature-dependent evolution of spin ordering and excitations of the frustrated tetragonal (c >a) spinel ZnMn2O4 across the two-dimensional antiferromagnetic transition. Muon spin relaxation indicates full development of ordered magnetic moments immediately below T-N = 62.7(2) K in spite of the apparent low-dimensional ordering. Using inelastic neutron scattering, we obtained the spin Hamiltonian accounting for the temperature-dependent spin excitations. The damped spin waves at high temperature exhibit a continuous increase in their lifetime on cooling across T-N. In contrast, the finite anisotropy gap appears suddenly below T-N indicating that single-ion anisotropy stabilizes the antiferromagnetic chains. We also observed the frustrated out-of-plane exchange contributing to the high-energy modes.
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