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

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Bibliographic Details
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]
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Database: Engineering Source
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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]
ISSN:00278424
DOI:10.1073/pnas.2007986117