Charge Transfer in Iridate-Manganite Superlattices.
Satoshi Okamoto1, John Nichols1, Changhee Sohn1
1Materials Science and Technology Division, Oak Ridge National Laboratory , Oak Ridge, Tennessee 37831, United States.
Nano Letters
|March 4, 2017
Summary
Charge transfer occurs in strontium iridate and strontium manganite superlattices due to a novel microscopic model. This finding offers new ways to control electronic states in oxide heterostructures.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Computational Materials Science
Background:
- Investigating charge transfer in oxide superlattices is crucial for understanding emergent electronic properties.
- Strontium iridate (SrIrO3) and strontium manganite (SrMnO3) superlattices exhibit unexpected charge transfer despite nonpolar interfaces.
Purpose of the Study:
- To develop a microscopic model explaining the significant charge transfer at SrIrO3/SrMnO3 interfaces.
- To understand the unique strain dependence of charge transfer in these iridate-manganite superlattices.
Main Methods:
- Density functional theory (DFT) calculations were employed to model the system.
- Experimental verification using soft X-ray and optical spectroscopy.
Main Results:
- A microscopic model was established, providing qualitative understanding of experimental charge transfer.
- Unique strain dependence of charge transfer in SrIrO3/SrMnO3 superlattices was identified.
- Model predictions were consistently verified by experimental spectroscopic data.
Conclusions:
- The study elucidates the mechanism behind charge transfer in nonpolar oxide heterostructures.
- A novel route to control electronic states in iridate-manganite superlattices has been demonstrated.
Keywords:
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