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Published on: March 24, 2019
Discovery of incipient ferrotoroidics from atomistic simulations
S Prosandeev1, A R Akbarzadeh, L Bellaiche
1Physics Department, University of Arkansas, Fayetteville, Arkansas 72701, USA.
Abstract:
An effective Hamiltonian technique is used to investigate the effect of quantum vibrations on properties of stress-free KTaO3 nanodots under open-circuit electrical boundary conditions. We discover that these vibrations suppress the paraelectric-to-ferrotoroidic transition, or, equivalently, wash out the formation of vortex states. Such suppression leads to the saturation of the so-called ferrotoroidic susceptibility at low temperature, and to a peculiar local structure that exhibits short-range, needlelike correlations of the individual toroidal moments.
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