Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice
Abstract
Despite the exciting implications of the Kitaev spin Hamiltonian, finding and confirming the quantum spin-liquid state have proven incredibly difficult. Recently, the applicability of the model has been expanded through the development of a microscopic description of a spin-1 Kitaev interaction. Here we explore a candidate spin-1 honeycomb system, KNiAsO4, which meets many of the proposed criteria to generate such an interaction. Bulk measurements reveal an antiferromagnetic transition at ~19 K which is generally robust to applied magnetic fields. Neutron diffraction measurements show magnetic order with a k=$$(\frac{3}{2},0,0)$$ ordering vector which results in the well-known “zigzag” magnetic structure thought to be adjacent to the spin-liquid ground state. Field-dependent diffraction shows that while the structure is robust, the field can tune the direction of the ordered moment. Inelastic neutron scattering experiments show a well-defined gapped spin-wave spectrum with no evidence of the continuum expected for fractionalized excitations. Modeling of the spin waves shows that the extended Kitaev spin Hamiltonian is are generally necessary to model the spectra and reproduce the observed magnetic order. First-principles calculations suggest that the substitution of Pd on the Ni sublattice may strengthen the Kitaev interactions while simultaneously weakening the exchange interactions thus pushing KNiAsO4 closer to the spin-liquid ground state.
- Authors:
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; University of Missouri Research Council
- OSTI Identifier:
- 1909734
- Alternate Identifier(s):
- OSTI ID: 1923151
- Grant/Contract Number:
- AC05-00OR22725; FG02-13ER41967; URC-22-021
- Resource Type:
- Published Article
- Journal Name:
- Physical Review Research
- Additional Journal Information:
- Journal Name: Physical Review Research Journal Volume: 5 Journal Issue: 1; Journal ID: ISSN 2643-1564
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; magnetic order; magnons; quantum spin liquid; honeycomb lattice; density functional theory; Kitaev-Heisenberg model; neutron scattering
Citation Formats
Taddei, K. M., Garlea, V. O., Samarakoon, A. M., Sanjeewa, L. D., Xing, J., Heitmann, T. W., dela Cruz, C., Sefat, A. S., and Parker, D. Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice KNiAsO 4. United States: N. p., 2023.
Web. doi:10.1103/PhysRevResearch.5.013022.
Taddei, K. M., Garlea, V. O., Samarakoon, A. M., Sanjeewa, L. D., Xing, J., Heitmann, T. W., dela Cruz, C., Sefat, A. S., & Parker, D. Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice KNiAsO 4. United States. https://doi.org/10.1103/PhysRevResearch.5.013022
Taddei, K. M., Garlea, V. O., Samarakoon, A. M., Sanjeewa, L. D., Xing, J., Heitmann, T. W., dela Cruz, C., Sefat, A. S., and Parker, D. Wed .
"Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice KNiAsO 4". United States. https://doi.org/10.1103/PhysRevResearch.5.013022.
@article{osti_1909734,
title = {Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice KNiAsO 4},
author = {Taddei, K. M. and Garlea, V. O. and Samarakoon, A. M. and Sanjeewa, L. D. and Xing, J. and Heitmann, T. W. and dela Cruz, C. and Sefat, A. S. and Parker, D.},
abstractNote = {Despite the exciting implications of the Kitaev spin Hamiltonian, finding and confirming the quantum spin-liquid state have proven incredibly difficult. Recently, the applicability of the model has been expanded through the development of a microscopic description of a spin-1 Kitaev interaction. Here we explore a candidate spin-1 honeycomb system, KNiAsO4, which meets many of the proposed criteria to generate such an interaction. Bulk measurements reveal an antiferromagnetic transition at ~19 K which is generally robust to applied magnetic fields. Neutron diffraction measurements show magnetic order with a k=$(\frac{3}{2},0,0)$ ordering vector which results in the well-known “zigzag” magnetic structure thought to be adjacent to the spin-liquid ground state. Field-dependent diffraction shows that while the structure is robust, the field can tune the direction of the ordered moment. Inelastic neutron scattering experiments show a well-defined gapped spin-wave spectrum with no evidence of the continuum expected for fractionalized excitations. Modeling of the spin waves shows that the extended Kitaev spin Hamiltonian is are generally necessary to model the spectra and reproduce the observed magnetic order. First-principles calculations suggest that the substitution of Pd on the Ni sublattice may strengthen the Kitaev interactions while simultaneously weakening the exchange interactions thus pushing KNiAsO4 closer to the spin-liquid ground state.},
doi = {10.1103/PhysRevResearch.5.013022},
journal = {Physical Review Research},
number = 1,
volume = 5,
place = {United States},
year = {Wed Jan 18 00:00:00 EST 2023},
month = {Wed Jan 18 00:00:00 EST 2023}
}
https://doi.org/10.1103/PhysRevResearch.5.013022
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