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Title: 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:
 [1];  [2]
  1. Univ. of California, Irvine, CA (United States)
  2. 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}
}

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Works referenced in this record:

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Works referencing / citing this record:

Persistence of the flat band in a kagome magnet with dipolar interactions
journal, October 2017


Persistence of the flat band in a kagome magnet with dipolar interactions
text, January 2017


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Degenerate and chiral states in the extended Heisenberg model on the kagome lattice
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journal, September 2018


Magnonic Analogue of Edelstein Effect in Antiferromagnetic Insulators
text, January 2019


Field-induced dynamical properties of the XXZ model on a honeycomb lattice
journal, January 2016


Swedenborgite CaBa(Mn 2 Fe 2 )O 7 with Spin Ordering on a Geometrically Frustrated, Polar, Non-centrosymmetric S = 5/2 Lattice
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