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Studies on the spin Hamiltonian parameters for Mn2+ in the ZnS nanocrystals and bulks
Authors:Guo-Liang Li  Shao-Yi Wu  Chang-Chun Ding  Xian-Fen Hu  Zhi-Hong Zhang
Affiliation:1. Department of Applied Physics, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, PR China;2. School of Physics and Engineering, Xingyi Normal University for Nationalities, Xingyi, PR China
Abstract:
The spin Hamiltonian parameters (zero-field splitting D, g factors and hyperfine structure constants) are theoretically studied for Mn2+ in the ZnS nanocrystals and bulks from the perturbation formulae of these quantities for trigonal and cubic tetrahedral 3d5 clusters, respectively. The trigonal Mn2+ centre in the ZnS nanocrystals is attributed to the impurity–ligand bond angle related to the C3 axis about 0.39° larger than that (≈109.47°) of an ideal tetrahedron. Almost the same g factors and hyperfine structure constants for the nanocrystals and bulks can be ascribed to similar crystal-field environments (i.e. comparable cubic field parameters Dq), nearly the same covalency (i.e. the equal covalency factors N) and the Mn2+ 3d–3s orbital admixture (i.e. the identical core polarisation constants κ) in both systems. The ligand orbital and spin–orbit coupling contributions are found to be important and should be included in the electron paramagnetic resonance analysis in view of significant covalency.
Keywords:electron paramagnetic resonance (EPR)  Mn2+  ZnS  nanocrystals
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