Enhanced magnetism and persistent insulating state in Mn doped Sr2IrO4
Yaodong Li1,2, Rui Niu1, Feng Xu1
1High Magnetic Field Laboratory of Anhui Province, HFIPS, Chinese Academy of Sciences, Hefei 230031, People's Republic of China.
Summary
Manganese (Mn) substitution in Sr2IrO4 preserves its insulating state but introduces competing magnetic interactions. Electron hopping between localized states governs conductivity in these novel materials.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Solid State Chemistry
Background:
- Sr2IrO4 is a correlated material exhibiting a Mott-insulating state.
- Understanding the effects of aliovalent substitution is crucial for tuning material properties.
Purpose of the Study:
- Investigate the impact of Mn substitution on the structural, transport, and magnetic properties of Sr2IrO4.
- Determine the interplay between different magnetic interactions upon Mn incorporation.
Main Methods:
- Synthesis and characterization of Sr2Ir1-xMnxO4 samples.
- Analysis of structural parameters (e.g., bond angles).
- Measurements of electrical transport and magnetic properties.
Main Results:
- Mn substitution increases the in-plane Ir-O-Ir bond angle but does not induce metallicity.
- Coexistence of Ir4+-O2--Ir4+ antiferromagnetic and Mn3+-O2--Mn4+ ferromagnetic interactions observed for x >= 0.06.
- Localized electronic and magnetic states result from the competition between these interactions.
Conclusions:
- Mn substitution in Sr2IrO4 leads to complex magnetic interactions and localized electronic states.
- Electron hopping between localized states is the dominant conduction mechanism.
- The Mott-insulating state persists despite Mn incorporation.
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