On the possible coexistence of spiral and collinear structures in antiferromagnetic KFe(MoO4)2 |
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Authors: | L. E. Svistov A. I. Smirnov L. A. Prozorova O. A. Petrenko A. Ya. Shapiro L. N. Dem’yanets |
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Affiliation: | (1) Kapitza Institute of Physical Problems, Russian Academy of Sciences, Moscow, 119334, Russia;(2) Department of Physics, University of Warwick, Coventry, CV4 7AL, UK;(3) Shubnikov Institute of Crystallography, Russian Academy of Sciences, Moscow, 117924, Russia |
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Abstract: | The static and resonance properties of a quasi-two-dimensional antiferromagnet phase on a distorted triangular lattice of KFe(MoO4)2 have been experimentally studied. Magnetization curves exhibit features corresponding to the spin-flop transition in a collinear biaxial antiferromagnet and simultaneously show a magnetization plateau characteristic of a triangular spin structure. The magnetic resonance spectra also display absorption lines corresponding to the spin structures of both types. The experimental data are described in terms of a model comprising alternating weakly bound magnetic layers, in which the main two exchange integrals have different values. Below the Néel temperature (T N =2.5 K), some of these layers possess a collinear antiferromagnetic structure, while the other layers have a triangular or spiral structure. |
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