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Ferromagnetism in CaMn(1-x)Ir(x)O(3)
S Mizusaki1, J Sato, T Taniguchi
1College of Science and Engineering, Aoyama Gakuin University, Fuchinobe, Sagamihara, Kanagawa 157-8572, Japan.
Summary
This study on CaMn(1-x)Ir(x)O(3) reveals a transition from antiferromagnetism to ferromagnetism with increasing iridium content. Mixed valence states of manganese and iridium ions explain the observed magnetic properties.
Area of Science:
- Materials Science
- Solid State Physics
- Magnetism
Background:
- Perovskite manganites exhibit complex magnetic and electric properties.
- Tuning properties via doping is crucial for materials development.
Purpose of the Study:
- Investigate the crystallographic, magnetic, and electric properties of CaMn(1-x)Ir(x)O(3) for 0≤x≤0.6.
- Understand the influence of iridium doping on the magnetic phase transitions and properties.
Main Methods:
- Synthesis and characterization of CaMn(1-x)Ir(x)O(3) samples.
- Crystallographic analysis using lattice constants.
- Magnetic property measurements including Néel temperature (T(N)), Curie temperature (T(C)), and effective moment (μ(eff)).
Main Results:
- Lattice constants increase with increasing iridium content.
- Antiferromagnetic behavior observed for 0.05≤x≤0.2, transitioning to ferromagnetism for 0.3≤x≤0.6.
- Néel temperature decreases, while Curie temperature increases with iridium content.
- Effective moment and Weiss temperature show composition dependence, explained by mixed valence states of Mn and Ir ions.
- Evidence suggests coexistence of antiferromagnetic and ferromagnetic phases.
Conclusions:
- Iridium doping induces a magnetic phase transition in CaMn(1-x)Ir(x)O(3).
- The observed properties are attributed to mixed valence states of Mn and Ir ions.
- Ferromagnetism emerges when the ferromagnetic phase fraction dominates the antiferromagnetic phase.
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