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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

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Published on: March 24, 2018

Na2IrO3 as a molecular orbital crystal.

I I Mazin¹, Harald O Jeschke, Kateryna Foyevtsova

¹Code 6393, Naval Research Laboratory, Washington, DC 20375, USA.

Physical Review Letters

|December 11, 2012

Summary

Sodium iridate (Na2IrO3) is not a Heisenberg-Kitaev model realization. Instead, its electronic structure is dominated by quasimolecular orbitals (QMOs), explaining its insulating behavior and antiferromagnetism.

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Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO

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Last Updated: May 16, 2026

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO

Production, Crystallization, and Structure Determination of the IKK-binding Domain of NEMO

Published on: December 28, 2019

Area of Science:

Solid-state physics
Quantum magnetism
Materials science

Background:

Previous studies classified Na2IrO3 using the Heisenberg-Kitaev model, emphasizing spin-orbit coupling.
This classification did not fully explain the observed magnetic and electronic properties.

Purpose of the Study:

To re-evaluate the electronic structure and magnetic properties of Na2IrO3.
To propose an alternative model that better describes the system's behavior.

Main Methods:

Density functional theory (DFT) calculations.
Model considerations based on electronic structure.

Main Results:

Na2IrO3's electronic structure is dominated by quasimolecular orbitals (QMOs).
These QMOs involve six atomic orbitals on an iridium (Ir) hexagon, with each Ir atom participating in three QMOs.
Substantial quenching of orbital moments was observed.
The QMO model naturally explains the insulating behavior and zigzag antiferromagnetism.

Conclusions:

The Heisenberg-Kitaev model is not the appropriate framework for Na2IrO3.
Quasimolecular orbitals offer a new perspective on the physics of Na2IrO3.
The QMO model provides a unified explanation for the electronic and magnetic properties of Na2IrO3.