Order and excitations in large-S kagomé-lattice antiferromagnets
Abstract
In this work, we systematically investigate the ground-state and the spectral properties of antiferromagnets on a kagomé lattice with several common types of the planar anisotropy: XXZ, single-ion, and out-of-plane Dzyaloshinskii-Moriya. Our main focus is on the role of nonlinear, anharmonic terms, which are responsible for the quantum order-by-disorder effect and for the corresponding selection of the ground-state spin structure in many of these models. The XXZ and the single-ion anisotropy models exhibit a quantum phase transition between the q=0 and the $$\sqrt{3}$$ ×$$\sqrt{3}$$ states as a function of the anisotropy parameter, offering a rare example of the quantum order-by-disorder fluctuations favoring a ground state which is different from the one selected by thermal fluctuations. The nonlinear terms are also shown to be crucial for a very strong near-resonant decay phenomenon leading to the quasiparticle breakdown in the kagomé-lattice antiferromagnets whose spectra are featuring flat or weakly dispersive modes. The effect is shown to persist even in the limit of large spin values and should be common to other frustrated magnets with flat branches of excitations. Model calculations of the spectrum of the S=5/2 Fe-jarosite with Dzyaloshinskii-Moriya anisotropy provide a convincing and detailed characterization of the proposed scenario.
- Authors:
-
- Univ. of California, Irvine, CA (United States)
- Alternative Energies and Atomic Energy Commission (CEA), Grenoble (France)
- Publication Date:
- Research Org.:
- Univ. of California, Irvine, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; National Science Foundation (NSF); USDOE
- OSTI Identifier:
- 1784346
- Alternate Identifier(s):
- OSTI ID: 1223547
- Grant/Contract Number:
- FG02-04ER46174; PHYS-1066293; PHY11-25915
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 14; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Chernyshev, A. L., and Zhitomirsky, M. E. Order and excitations in large-S kagomé-lattice antiferromagnets. United States: N. p., 2015.
Web. doi:10.1103/physrevb.92.144415.
Chernyshev, A. L., & Zhitomirsky, M. E. Order and excitations in large-S kagomé-lattice antiferromagnets. United States. https://doi.org/10.1103/physrevb.92.144415
Chernyshev, A. L., and Zhitomirsky, M. E. Tue .
"Order and excitations in large-S kagomé-lattice antiferromagnets". United States. https://doi.org/10.1103/physrevb.92.144415. https://www.osti.gov/servlets/purl/1784346.
@article{osti_1784346,
title = {Order and excitations in large-S kagomé-lattice antiferromagnets},
author = {Chernyshev, A. L. and Zhitomirsky, M. E.},
abstractNote = {In this work, we systematically investigate the ground-state and the spectral properties of antiferromagnets on a kagomé lattice with several common types of the planar anisotropy: XXZ, single-ion, and out-of-plane Dzyaloshinskii-Moriya. Our main focus is on the role of nonlinear, anharmonic terms, which are responsible for the quantum order-by-disorder effect and for the corresponding selection of the ground-state spin structure in many of these models. The XXZ and the single-ion anisotropy models exhibit a quantum phase transition between the q=0 and the $\sqrt{3}$ ×$\sqrt{3}$ states as a function of the anisotropy parameter, offering a rare example of the quantum order-by-disorder fluctuations favoring a ground state which is different from the one selected by thermal fluctuations. The nonlinear terms are also shown to be crucial for a very strong near-resonant decay phenomenon leading to the quasiparticle breakdown in the kagomé-lattice antiferromagnets whose spectra are featuring flat or weakly dispersive modes. The effect is shown to persist even in the limit of large spin values and should be common to other frustrated magnets with flat branches of excitations. Model calculations of the spectrum of the S=5/2 Fe-jarosite with Dzyaloshinskii-Moriya anisotropy provide a convincing and detailed characterization of the proposed scenario.},
doi = {10.1103/physrevb.92.144415},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 14,
volume = 92,
place = {United States},
year = {Tue Oct 13 00:00:00 EDT 2015},
month = {Tue Oct 13 00:00:00 EDT 2015}
}
Web of Science
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