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Mixed Nd4+/3+ and Cluster Magnetism in Hexagonal Perovskite 12R-Ba4NdMn3O12-γ
Liam A V Nagle-Cocco1, Madeline G Port1,2, James Eujin Park3
1Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
Researchers explored hexagonal perovskite oxides, discovering partial tetravalent neodymium (Nd4+) in 12R-Ba4NdMn3O12-γ. This study reveals a novel collinear antiferromagnetic structure, expanding understanding of magnetic properties in these materials.
Area of Science:
- Materials Science
- Solid-State Chemistry
- Magnetism
Background:
- Hexagonal perovskite oxides with 12R stacking exhibit unique face-sharing octahedral metal trimers.
- These structures can display significant magnetic frustration and cluster magnetism.
- Tuning magnetism by neighboring cations in these trimers is an active area of research.
Purpose of the Study:
- To investigate the impact of neodymium (Nd) proximity to manganese (Mn) trimers in 12R-Ba4NdMn3O12-γ.
- To explore the potential realization of tetravalent neodymium (Nd4+) in an oxide environment.
- To analyze the resulting magnetic properties and structural characteristics.
Main Methods:
- Bulk magnetic measurements (magnetometry).
- X-ray absorption spectroscopy (XAS).
- Powder neutron diffraction (PND).
Main Results:
- Confirmation of partial tetravalent neodymium (Nd4+) in 12R-Ba4NdMn3O12-γ, with some Nd existing as trivalent (Nd3+).
- Oxygen vacancies were observed, balancing the charge.
- An antiferromagnetic ordering temperature (TN) of approximately 16 K was determined.
- A novel collinear antiferromagnetic structure (magnetic space group Pc2/m) was identified via PND.
Conclusions:
- The study presents the first observation of partial Nd4+ in an oxide material.
- The findings demonstrate that this class of hexagonal perovskites can host diverse and unpredictable magnetic structures.
- Compositional trends alone are insufficient to predict the magnetic behavior of these materials.
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