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Title: Amplitude mode in the planar triangular antiferromagnet Na 0.9MnO 2

Abstract

Amplitude modes arising from symmetry breaking in materials are of broad interest in condensed matter physics. These modes reflect an oscillation in the amplitude of a complex order parameter, yet are typically unstable and decay into oscillations of the order parameter’s phase. This renders stable amplitude modes rare, and exotic effects in quantum antiferromagnets have historically provided a realm for their detection. We report an alternate route to realizing amplitude modes in magnetic materials by demonstrating that an antiferromagnet on a two-dimensional anisotropic triangular lattice (α-Na 0.9MnO 2) exhibits a long-lived, coherent oscillation of its staggered magnetization field. Our results show that geometric frustration of Heisenberg spins with uniaxial single-ion anisotropy can renormalize the interactions of a dense two-dimensional network of moments into largely decoupled, one-dimensional chains that manifest a longitudinally polarized-bound state. This bound state is driven by the Ising-like anisotropy inherent to the Mn 3+ ions of this compound.

Authors:
 [1]; ORCiD logo [2];  [2];  [3]; ORCiD logo [4];  [3];  [5];  [6]
  1. Univ. of California, Santa Barbara, CA (United States). Materials Dept.; Boston College, Chestnut Hill, MA (United States). Dept. of Physics
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
  3. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research
  4. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Neutron Scattering Division
  5. Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics
  6. Univ. of California, Santa Barbara, CA (United States). Materials Dept.
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1474479
Grant/Contract Number:  
AC05-00OR22725; SC0017752; FG02-08ER 46524
Resource Type:
Accepted Manuscript
Journal Name:
Nature Communications
Additional Journal Information:
Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Dally, Rebecca L., Zhao, Yang, Xu, Zhijun, Chisnell, Robin, Stone, Matthew B., Lynn, Jeffrey W., Balents, Leon, and Wilson, Stephen D. Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2. United States: N. p., 2018. Web. doi:10.1038/s41467-018-04601-1.
Dally, Rebecca L., Zhao, Yang, Xu, Zhijun, Chisnell, Robin, Stone, Matthew B., Lynn, Jeffrey W., Balents, Leon, & Wilson, Stephen D. Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2. United States. doi:10.1038/s41467-018-04601-1.
Dally, Rebecca L., Zhao, Yang, Xu, Zhijun, Chisnell, Robin, Stone, Matthew B., Lynn, Jeffrey W., Balents, Leon, and Wilson, Stephen D. Tue . "Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2". United States. doi:10.1038/s41467-018-04601-1. https://www.osti.gov/servlets/purl/1474479.
@article{osti_1474479,
title = {Amplitude mode in the planar triangular antiferromagnet Na0.9MnO2},
author = {Dally, Rebecca L. and Zhao, Yang and Xu, Zhijun and Chisnell, Robin and Stone, Matthew B. and Lynn, Jeffrey W. and Balents, Leon and Wilson, Stephen D.},
abstractNote = {Amplitude modes arising from symmetry breaking in materials are of broad interest in condensed matter physics. These modes reflect an oscillation in the amplitude of a complex order parameter, yet are typically unstable and decay into oscillations of the order parameter’s phase. This renders stable amplitude modes rare, and exotic effects in quantum antiferromagnets have historically provided a realm for their detection. We report an alternate route to realizing amplitude modes in magnetic materials by demonstrating that an antiferromagnet on a two-dimensional anisotropic triangular lattice (α-Na0.9MnO2) exhibits a long-lived, coherent oscillation of its staggered magnetization field. Our results show that geometric frustration of Heisenberg spins with uniaxial single-ion anisotropy can renormalize the interactions of a dense two-dimensional network of moments into largely decoupled, one-dimensional chains that manifest a longitudinally polarized-bound state. This bound state is driven by the Ising-like anisotropy inherent to the Mn3+ ions of this compound.},
doi = {10.1038/s41467-018-04601-1},
journal = {Nature Communications},
number = 1,
volume = 9,
place = {United States},
year = {2018},
month = {6}
}

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