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Tb-based silicate apatites showing slow magnetization relaxation with identical parameters for the Tb3+ and Dy3+
Mikhail A Zykin1,2, Andrey K Dyakonov1, Artem A Eliseev1
1Department of Chemistry, Lomonosov Moscow State University 119991 Moscow Russia kazin@inorg.chem.msu.ru +7 495 9393440.
Abstract:
Tb-diluted and Tb-rich apatite-type silicates with compositions Y7.75Tb0.25Ca2(SiO4)6O2 and Tb8Ca2(SiO4)6O2, respectively, exhibit field induced multiple slow relaxation of magnetization. The former reveals two slow relaxation paths, the latter only one with a longer relaxation time of several seconds. The relaxation features of the Tb-diluted one are comparable with those of analogue compounds, where Tb is replaced by Dy, as well as with those of a Tb-doped calcium phosphate apatite. The relaxation parameters of the Tb-rich compound virtually match those of the Dy-based analogue Dy8Ca2(SiO4)6O2. The latter represents the first instance of independence of magnetization relaxation on the nature of a paramagnetic rare-earth metal ion in single ion magnet like materials.
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