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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
Published on: June 28, 2018
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Kitaev Spin Liquid in 3d Transition Metal Compounds
Huimei Liu1, Jiří Chaloupka2,3, Giniyat Khaliullin1
1Max Planck Institute for Solid State Research, Heisenbergstrasse 1, D-70569 Stuttgart, Germany.
Physical Review Letters
|August 16, 2020
Summary
Honeycomb cobaltates exhibit Kitaev model physics, driven by bond-dependent Ising couplings. These materials are close to a spin liquid state, achievable with minor adjustments to the crystal field.
Area of Science:
- Condensed Matter Physics
- Quantum Magnetism
Background:
- Honeycomb cobaltates feature Co^{2+} ions with significant spin-orbit coupling.
- The low-energy magnetic interactions can be described by a pseudospin-1/2 Hamiltonian.
Purpose of the Study:
- Investigate exchange interactions and magnetic phases in honeycomb cobaltates.
- Determine the proximity of Na_{3}Co_{2}SbO_{6} to a Kitaev spin liquid phase.
Main Methods:
- Theoretical modeling of magnetic interactions using a pseudospin-1/2 Hamiltonian.
- Analysis of the influence of trigonal crystal fields on magnetic phases.
Main Results:
- The low-energy Hamiltonian is dominated by bond-dependent Ising couplings, forming the Kitaev model.
- Non-Kitaev terms are minimal at small trigonal fields, leading to a spin liquid ground state.
- Na_{3}Co_{2}SbO_{6} is near a Kitaev spin liquid phase, tunable via crystal field modifications.
Conclusions:
- Cobaltates are promising candidates for realizing Kitaev model physics due to localized 3d magnetic electrons.
- Strain or pressure can tune Na_{3}Co_{2}SbO_{6} into a Kitaev spin liquid state.
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