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Simultaneous Antiferromagnetic Order and Spin-Glass-like Behavior in MnAsO(4)
Miguel A. G. Aranda1, J. Paul Attfield, Elaine Batchelor
1Departamento de Química Inorgánica, Cristalografía y Mineralogía, Universidad de Málaga, 29071 Málaga, Spain, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K., and Departamento de Física Aplicada, Universidad de Málaga, 29071 Málaga, Spain.
Inorganic Chemistry
|October 24, 2001
Summary
Researchers studied a new magnetic solid, MnAsO(4), finding an unusual antiferromagnetic structure. Half of the manganese (Mn) spins are idle, showing spin-glass behavior, and frustration reduces the ordered moment.
Area of Science:
- Solid-state chemistry
- Magnetism
- Crystallography
Background:
- Understanding magnetic ordering in new solid compounds is crucial for materials science.
- Manganese arsenates are of interest due to their diverse magnetic properties.
Purpose of the Study:
- To investigate the magnetic ordering and crystal structure of a newly synthesized manganese arsenate, MnAsO(4).
- To characterize the magnetic behavior, including spin ordering and potential spin-glass phenomena.
Main Methods:
- Low-temperature time-of-flight neutron powder diffraction was employed to determine the crystal and magnetic structures.
- Magnetic susceptibility measurements were conducted to probe spin dynamics.
Main Results:
- MnAsO(4) exhibits antiferromagnetic ordering at 14.5(5) K with an unusual structure where only half of the Mn(3+) spins are ordered.
- The ordered magnetic moment is reduced to 2.6 μ(B) due to frustration, and idle spins display spin-glass characteristics.
- The antiferromagnetic structure of the coexisting Mn(2)As(2)O(7) phase, ordering at 10.5(5) K, was also determined.
Conclusions:
- The study reveals a complex magnetic structure in MnAsO(4) involving frustrated and spin-glass-like behavior.
- The findings highlight the intricate interplay between crystal structure and magnetic properties in manganese arsenates.