Mössbauer Study of the Modulated Magnetic Structure of FeVO4статья

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Дата последнего поиска статьи во внешних источниках: 14 августа 2017 г.

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[1] Mössbauer study of the modulated magnetic structure of fevo4 / A. V. Sobolev, I. A. Presnyakov, V. S. Rusakov et al. // Journal of Experimental and Theoretical Physics. — 2017. — Vol. 124, no. 6. — P. 943–956. Mössbauer spectroscopy is used to study the FeVO4 multiferroic, which undergoes two magnetic phase transitions at TN1 ≈ 22 K and TN2 ≈ 15 K. The first transition (TN1) is related to transformation from a paramagnetic state into a magnetically ordered state of a spin density wave, and the second transition (TN2) is associated with a change in the type of the spatial magnetic structure of the vanadate. The electric field gradient tensor at 57Fe nuclei is calculated to perform a crystal-chemical identification of the partial Mössbauer spectra corresponding to various crystallographic positions of Fe3+ cations. The spectra measured in the range TN2 < T < TN1 are analyzed on the assumption about amplitude modulation of the magnetic moments of iron atoms μFe. The results of model intersection of the spectra recorded at T < TN2 point to a high degree of anharmonicity of the helicoidal magnetic structure of the vanadate and to elliptic polarization of μFe. These features are characteristic of type-II multiferroics. The temperature dependences of the hyperfine interaction parameters of 57Fe nuclei that were obtained in this work are analyzed in terms of the Weiss molecular field model on the assumption of orbital contribution to the magnetic moments of iron cations. [ DOI ]

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