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. Here 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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Dally RL,Zhao Y,Xu Z,Chisnell R,Stone MB,Lynn JW,Balents L,Wilson SDdoi
10.1038/s41467-018-04601-1subject
Has Abstractpub_date
2018-06-05 00:00:00pages
2188issue
1issn
2041-1723pii
10.1038/s41467-018-04601-1journal_volume
9pub_type
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