Physics – Condensed Matter – Materials Science
Scientific paper
2012-03-17
Physics
Condensed Matter
Materials Science
25 pages, 5 figures and 3 tables and Submitted to Physical Review B
Scientific paper
We report the observation of para - antiferromagnetic transition at ~ 50 K in lithium iron phosphate, LiFePO4 through DC magnetization and M\"ossbauer spectroscopy. The Ferrous ion Fe2+ (3d6, 5D) in LiFePO4 exhibits relaxation effects with a relaxation frequency ~1.076 \times 10(rise to 7) s-1 at 300 K. The temperature dependence of the frequency suggests the origin of the relaxation is spin-lattice type. The quadrupole splitting at low temperatures indicates the excited orbital states mix strongly to the orbital doublet ground state via spin-orbit coupling. Modified molecular field model analysis yields a saturation value for hyperfine field ~125 kOe. The anomaly in magnetization and M\"ossbauer parameters below 27 K may be ascribed to contribution of orbital angular momentum. The high value of the asymmetry parameter ({\eta} ~ 0.8) of the electric field gradient obtained in the antiferromagnetic regime indicates a strongly distorted octahedral oxygen neighbourhood for the ferrous sites.
Bansal C.
Brand Richard A.
Hahn Horst
Mishra Ajay Kumar
Sunandana C. S.
No associations
LandOfFree
Magnetic Phase Transition and Relaxation Effects in LiFePO4 does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Magnetic Phase Transition and Relaxation Effects in LiFePO4, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Magnetic Phase Transition and Relaxation Effects in LiFePO4 will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-313086