Dysprosium magnesium silicate apatite featuring field and temperature stable slow magnetization relaxation |
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| Authors: | Pavel E. Kazin Mikhail A. Zykin Lev A. Trusov Alexander V. Vasiliev Reinhard K. Kremer Robert E. Dinnebier Martin Jansen |
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| Affiliation: | Department of Chemistry, Lomonosov Moscow State University, 119991 Moscow Russia, +7 495 9393440 ; Institute of General and Inorganic Chemistry RAS (IGIC RAS), 31 Leninsky Ave., 119991 Moscow Russia ; Max Planck Institute for Solid State Research, Heisenbergstrasse 1, 70569 Stuttgart Germany |
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| Abstract: | Dy–Mg silicate Dy8Mg2(SiO4)6O2 has been prepared by high-temperature solid state reaction. It has an apatite type structure (P63/m) with the Dy atoms fully occupying the 6h site and being in random distribution with the Mg atoms at the 4f site. The compound reveals dual magnetization relaxation with widely varying contributions from fast (FR) and slow (SR) relaxation paths controlled by field and temperature. The SR path is stabilized by a strong magnetic field, exhibits a weak dependence of relaxation time τ on field and temperature, and sustains large τ of a few seconds up to a temperature of 40 K and under a field of 50 kOe. The analysis of the electronic structure and comparison with the known Dy-doped phosphate apatites suggests that the Orbach and Raman processes are suppressed.The compound reveals dual magnetization relaxation with largely varying contributions from fast and slow relaxation paths controlled by field and temperature. The relaxation times retain values of a few seconds up to 40 K. |
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