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Published on: December 3, 2013
Outstanding TC Enhancement in 5d-3d Y2NiIrO6 by Compression
Zheng Deng1, Yao Zhang2, Sijia Zhang1
1Beijing National Laboratory For Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences and School of Physics, University of Chinese Academy of Sciences, Beijing, China.
Summary
Applying physical pressure to Y2NiIrO6 (YNIO) enhances its ferrimagnetic properties by increasing the Curie temperature. This study reveals how pressure affects superexchange interactions in 5d compounds, suppressing magnetic frustration.
Area of Science:
- Condensed Matter Physics
- Materials Science
- Magnetism
Background:
- Understanding magnetism in 5d compounds requires identifying superexchange interactions.
- Double perovskite Y2NiIrO6 (YNIO) is a ferrimagnetic insulator with an Ir4+ 5d Jeff = 1/2 Mott-insulating state at ambient pressure.
Purpose of the Study:
- To investigate the effects of physical pressure on the magnetic properties of Y2NiIrO6 (YNIO).
- To elucidate the mechanism of 5d-3d superexchange and guide bond-engineered magnetism in iridate systems.
Main Methods:
- Experimental study of pressure effects on YNIO up to 17 GPa.
- Analysis of Ni/Ir-O bond lengths and Ni-O-Ir bond angles under pressure.
- Comparison with related materials like Sr2IrO4 and La2NiMnO6.
Main Results:
- Physical pressure increases the Curie temperature of YNIO from 192 K to 243 K.
- Pressure causes concurrent compression of Ni/Ir-O bonds and Ni-O-Ir angles.
- Rock-salt ordered Ni-Ir and orthogonal Ni eg-Ir t2g pathways suppress magnetic frustration, unlike in other iridates.
Conclusions:
- The study establishes a framework for understanding 5d-3d superexchange mechanisms.
- Lattice distortion robustly maintains the Ni-Ir superexchange pathway in YNIO.
- Findings guide the engineering of magnetism in iridate-based materials through bond manipulation.
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