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An orbital strategy for regulating the Jahn-Teller effect.

Tongtong Shang^1,2, Ang Gao^1,2, Dongdong Xiao^2,3

¹State Key Laboratory of New Ceramics and Fine Processing, National Center for Electron Microscopy in Beijing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China.

National Science Review

|August 23, 2024

Summary

This summary is machine-generated.

Researchers developed a local coordinate strategy to control the Jahn-Teller effect (JTE) in transition-metal oxides. This method precisely manipulates orbital occupancy and ligand symmetry, enabling tailored material properties for advanced functional materials.

Keywords:

Jahn–Teller effect local coordinate strategy orbital degenerate quantitative convergent-beam electron diffraction transition-metal oxide

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Area of Science:

Materials Science
Condensed Matter Physics
Solid-State Chemistry

Background:

The Jahn-Teller effect (JTE) significantly influences the physical properties of transition-metal compounds due to lattice-electron coupling.
Tailoring material functionalities necessitates precise control over JT distortions and associated electronic structures.

Purpose of the Study:

To propose and demonstrate a novel local coordinate strategy for regulating the Jahn-Teller effect in transition-metal oxides.
To provide guidelines for designing functional materials with tunable lattice-orbital coupling and specific physical properties.

Main Methods:

Quantified orbital occupancy in the e_g and t_2g orbitals of Manganese (Mn).
Scrutinized the symmetries of ligand oxygen atoms within MnO₆ octahedra in LiMn₂O₄ and Li_0.5Mn₂O₄.
Constructed P2-type NaLi_xMn_1-xO₂ oxides with varying Li/Mn ordering schemes to validate the strategy.

Main Results:

Demonstrated the effectiveness of the local coordinate strategy in controlling JT distortions.
Showcased the strategy's applicability to various 3d transition-metal compounds in spinel and perovskite structures.
Confirmed the universality of the local coordinate strategy and the tunability of lattice-orbital coupling.

Conclusions:

The local coordinate strategy offers a powerful approach to regulate JT distortion in transition-metal oxides.
This method facilitates the design of advanced functional materials with predictable and desirable physical properties.
The findings provide valuable insights for future materials design and discovery.