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Antiferromagnetism and spin reorientation in "PbCrO3"
Angel M Arévalo-López1, Antonio J Dos santos-García, Miguel A Alario-Franco
1Departamento de Química Inorgánica, Facultad de Químicas, Universidad Complutense de Madrid, 28040 Madrid, Spain.
Inorganic Chemistry
|May 9, 2009
Summary
The perovskite PbCrO(3) exhibits complex magnetic behavior, including a weak ferromagnetic transition and a spin reorientation. This spin reorientation is likely driven by an intrinsic magnetoelectric effect linked to lead electrons.
Area of Science:
- Solid State Physics
- Materials Science
- Magnetism
Background:
- Previous studies suggested a G-type antiferromagnetic structure for PbCrO(3).
- High-pressure, high-temperature synthesis enables the investigation of novel material properties.
Purpose of the Study:
- To investigate the magnetic properties of synthesized PbCrO(3).
- To clarify the complex magnetic transitions observed in PbCrO(3).
Main Methods:
- Synthesis of PbCrO(3) under high pressure and high temperature.
- Magnetic property measurements including magnetization, specific heat, and resistivity.
Main Results:
- A weak ferromagnetic transition of Cr(IV) spins was observed at 245 K.
- A temperature-driven spin reorientation occurred between 185 K and 62 K.
- The spin reorientation was not expected in the absence of an external magnetic field.
Conclusions:
- The observed spin reorientation suggests an intrinsic magnetoelectric effect in PbCrO(3).
- Lone-pair electrons on lead atoms are proposed to be responsible for the spin rotation.
- PbCrO(3) exhibits a more complex magnetic structure than previously understood.
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