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Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb2O6.

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Title: Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb2O6.
Authors: Fava, Michele1, Coldea, Radu2, Parameswaran, S. A.1 sid.parameswaran@physics.ox.ac.uk
Source: Proceedings of the National Academy of Sciences of the United States of America. 10/13/2020, Vol. 117 Issue 41, p25219-25224. 6p.
Subjects: Symmetry breaking, Magnets, Neutron scattering, Unit cell, Factor structure
Abstract: We construct a microscopic spin-exchange Hamiltonian for the quasi-one-dimensional (1D) Ising magnet CoNb2O6 that captures detailed and hitherto-unexplained aspects of its dynamic spin structure factor. We perform a symmetry analysis that recalls that an individual Ising chain in this material is buckled, with two sites in each unit cell related by a glide symmetry. Combining this with numerical simulations benchmarked against neutron scattering experiments, we argue that the single-chain Hamiltonian contains a staggered spin-exchange term. We further argue that the transverse-field-tuned quantum critical point in CoNb2O6 corresponds to breaking this glide symmetry, rather than an on-site Ising symmetry as previously believed. This gives a unified microscopic explanation of the dispersion of confined states in the ordered phase and quasiparticle breakdown in the polarized phase at high transverse field. [ABSTRACT FROM AUTHOR]
Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: We construct a microscopic spin-exchange Hamiltonian for the quasi-one-dimensional (1D) Ising magnet CoNb2O6 that captures detailed and hitherto-unexplained aspects of its dynamic spin structure factor. We perform a symmetry analysis that recalls that an individual Ising chain in this material is buckled, with two sites in each unit cell related by a glide symmetry. Combining this with numerical simulations benchmarked against neutron scattering experiments, we argue that the single-chain Hamiltonian contains a staggered spin-exchange term. We further argue that the transverse-field-tuned quantum critical point in CoNb2O6 corresponds to breaking this glide symmetry, rather than an on-site Ising symmetry as previously believed. This gives a unified microscopic explanation of the dispersion of confined states in the ordered phase and quasiparticle breakdown in the polarized phase at high transverse field. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Proceedings of the National Academy of Sciences of the United States of America is the property of National Academy of Sciences and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1073/pnas.2007986117
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        Text: English
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      – SubjectFull: Symmetry breaking
        Type: general
      – SubjectFull: Magnets
        Type: general
      – SubjectFull: Neutron scattering
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      – SubjectFull: Unit cell
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      – SubjectFull: Factor structure
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      – TitleFull: Glide symmetry breaking and Ising criticality in the quasi-1D magnet CoNb2O6.
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              Text: 10/13/2020
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