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Regular version of the site

Article

Competition between dynamic and structural disorder in a doped triangular fntiferromagnet RbFe(MoO4)2

Journal of Physics: Conference Series. 2018. Vol. 969. P. 1-7.
Smirnov A., Soldatov T. A., Petrenko O. A., Takata A., Kida T., Hagiwara M., Zhitomirsky M. E., Shapiro A. Y.

Magnetisation  measurements and ESR spectra of a doped quasi 2D antiferromagnet  on a triangular lattice reveal a crucial change of the ground state spin configuration and a disappearance of a characteristic 1/3-magnetisation  plateau under a doping.
According to theory, this is a result of the competition between the structural and dynamic disorders.
The dynamic zero-point or thermal fluctuations are known to  lift the degeneracy of the mean field ground state of a triangular magnet and cause the spin configuration to be the most collinear, while the static disorder provides another selection of the ground state, with the least collinear structure.
Low-level doping  was found to decrease the N\'{e}el temperature and saturation field by only few percent, while the magnetisation  plateau disappears completely and the spin configuration is drastically changed.
ESR spectra confirm an impurity-induced change of the so-called Y-type structure to an inverted Y-structure for 15%-doping by potassium.