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Title: Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β Li 2 IrO 3

Abstract

We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet β–Li 2IrO 3. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key qualitatively features. The period-3 state shows very different structure when either the Kitaev interaction K or the off-diagonal exchange anisotropy Γ is dominant. A comparison of the associated static spin structure factors with reported scattering experiments in zero and finite fields gives strong evidence that β–Li 2IrO 3 lies in the regime of dominant Kitaev coupling, and that the Heisenberg exchange J is much weaker than both K and Γ. Furthermore, our predictions for the magnon excitation spectra, the dynamical spin structure factors, and their polarization dependence provide additional distinctive fingerprints that can be checked experimentally.

Authors:
 [1];  [1];  [1]
  1. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Research Org.:
Univ. of Minnesota, Minneapolis, MN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
OSTI Identifier:
1637941
Alternate Identifier(s):
OSTI ID: 1426520
Grant/Contract Number:  
SC0018056; DMR-1511768; PHY-1125915
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 12; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
magnetic interactions; spin waves; honeycomb lattice; Kitaev-Heisenberg model

Citation Formats

Ducatman, Samuel, Rousochatzakis, Ioannis, and Perkins, Natalia B. Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β–Li2IrO3. United States: N. p., 2018. Web. doi:10.1103/PhysRevB.97.125125.
Ducatman, Samuel, Rousochatzakis, Ioannis, & Perkins, Natalia B. Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β–Li2IrO3. United States. doi:10.1103/PhysRevB.97.125125.
Ducatman, Samuel, Rousochatzakis, Ioannis, and Perkins, Natalia B. Fri . "Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β–Li2IrO3". United States. doi:10.1103/PhysRevB.97.125125. https://www.osti.gov/servlets/purl/1637941.
@article{osti_1637941,
title = {Magnetic structure and excitation spectrum of the hyperhoneycomb Kitaev magnet β–Li2IrO3},
author = {Ducatman, Samuel and Rousochatzakis, Ioannis and Perkins, Natalia B.},
abstractNote = {We present a theoretical study of the static and dynamical properties of the three-dimensional, hyperhoneycomb Kitaev magnet β–Li2IrO3. We argue that the observed incommensurate order can be understood in terms of a long-wavelength twisting of a nearby commensurate period-3 state, with the same key qualitatively features. The period-3 state shows very different structure when either the Kitaev interaction K or the off-diagonal exchange anisotropy Γ is dominant. A comparison of the associated static spin structure factors with reported scattering experiments in zero and finite fields gives strong evidence that β–Li2IrO3 lies in the regime of dominant Kitaev coupling, and that the Heisenberg exchange J is much weaker than both K and Γ. Furthermore, our predictions for the magnon excitation spectra, the dynamical spin structure factors, and their polarization dependence provide additional distinctive fingerprints that can be checked experimentally.},
doi = {10.1103/PhysRevB.97.125125},
journal = {Physical Review B},
issn = {2469-9950},
number = 12,
volume = 97,
place = {United States},
year = {2018},
month = {3}
}

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Cited by: 10 works
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