Related Experiment Video
Updated: May 13, 2026
09:06
Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
Published on: March 24, 2019
Zigzag magnetic order in the iridium oxide Na2IrO3
Jiří Chaloupka1, George Jackeli, Giniyat Khaliullin
1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Physical Review Letters
|March 19, 2013
Summary
We mapped the phase diagram for spin-orbit Mott insulators on a honeycomb lattice. Zigzag magnetic order is prevalent, originating from interorbital hopping, and validated with experimental data for Na2IrO3 and Li2IrO3.
Area of Science:
- Condensed Matter Physics
- Quantum Materials
- Solid State Physics
Background:
- Spin-orbit Mott insulators on honeycomb lattices exhibit complex magnetic phases.
- The Kitaev-Heisenberg model is a key theoretical framework for understanding these materials.
- Understanding the interplay of spin-orbit coupling and electron correlations is crucial.
Purpose of the Study:
- To explore the complete phase diagram of spin-orbit Mott insulators within the Kitaev-Heisenberg model.
- To identify the prevalence and origin of zigzag magnetic order.
- To determine spin coupling constants for specific iridate materials.
Main Methods:
- Investigated the phase diagram of the Kitaev-Heisenberg model across its full parameter space.
- Analyzed the physical origin of magnetic ordering, specifically zigzag-type order.
- Calculated magnetic susceptibility, spin wave spectra, and the zigzag order parameter.
Main Results:
- Zigzag-type magnetic order dominates a significant portion of the model's phase diagram.
- The emergence of zigzag order is attributed to interorbital t(2g)-e(g) hopping.
- Calculated parameters show good agreement with experimental data for Na2IrO3 and Li2IrO3.
Conclusions:
- The Kitaev-Heisenberg model accurately describes the magnetic properties of honeycomb spin-orbit Mott insulators.
- Interorbital hopping is a key mechanism driving zigzag magnetic order in these systems.
- The study provides crucial spin coupling constants for Na2IrO3 and Li2IrO3, aiding experimental verification.
More Related Videos
Related Concept Videos
01:31Ferromagnetism
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
03:02Colors and Magnetism
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human eye.
01:26Diamagnetism
Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets.
02:42Ionic Crystal Structures
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
01:23Atomic Nuclei: Nuclear Relaxation Processes
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis, the precessing magnetic moments are randomly oriented around the z-axis. This...
02:42Valence Bond Theory
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...