Magnetoresonance properties of antiferromagnetic TbFe3(BO3)4 at low temperatures

The Raman scattering spectrum of single crystal TbFe3(BO3)4 was studied in the frequency range 3–500 cm−1 at temperatures from 2 to 300 K. It was found that in high- and low-temperature phases there exist additional phonon lines which were not known before. In the high-temperature phase, these lines originate from LO–TO splitting of polar phonons. Appearance of the additional lines in the low temperature phase is due to both a reduction of the crystal symmetry under the phase transition and an increase of the primitive cell volume. It was established that the frequencies of some phonon lines in the magneto-ordered phase are shifted towards the high-energy region upon applying an external magnetic field along the third-order axis. The spectrum of two-magnon Raman scattering was investigated. It was shown that at low temperatures the two-magnon band has a complex shape that reflects specific features in the density of state of the magnon branches. The magnon energy at the Brillouin zone boundary was determined.

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Raman scattering under structural and magnetic phase transitions in terbium ferroborate

Peschanskiı̆

Yeremenko

Фомин

et al. 2014

Low Temperature Physics

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Raman scattering in multiferroic SmFe3(BO3)4

Peschanskiı̆

Фомин

Гудим

2016

Low Temperature Physics

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Raman spectrum of single-crystal SmFe3(BO3)4 was studied in the frequency range from 3 to 1500 cm−1 at temperatures 10–300 K. All the A1 and E phonon modes predicted by the group theory for a given symmetry of the crystal were observed. The magnitudes of splitting between the LO and TO components of polar E phonons were determined. It was found that under the transition to a magnetically ordered phase, the behavior of the intensity of the line corresponding to the A1 vibrational mode is anomalous. It was shown that at low temperatures the spectrum of two-magnon excitations has a complex shape and is observed with both nondiagonal and diagonal components of the scattering tensor. This complex shape reflects the features in the density of states of the magnetic branches. An estimate of the magnon energy Em at the Brillouin zone boundary gave ∼47 cm−1. The structure of the ground multiplet 6H5/2 of a Sm+3 ion in paramagnetic and antiferromagnetic states as well as the effect of the magnetic phase transition on it were studied. Electron-phonon interaction for the electronic excitation at 225 cm−1 was revealed.

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Magnetic properties of DyCr3(BO3)4

Bludov

Savina

Pashchenko

et al. 2020

Low Temperature Physics

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Structural, magnetic, and thermal studies of DyCr3(BO3)4 have been carried out. Structural studies showed that the sample contains two phases, with the contents of the rhombohedral (R32) and monoclinic (C2/c) phases being the same, within the accuracy of the method. The lattice parameters for each phase were determined (the rhombohedral: a = 9.461 Å, c = 7.488 Å; the monoclinic: a = 7.394 Å, b = 9.450 Å, c = 11.357 Å, β = 103.9°). It was found that both structural modifications of dysprosium-chromium borate are ordered antiferromagnetically, with their own Néel temperature (rhombohedral: TN1 = 9.1 K, monoclinic: TN2 = 7.5 K). Spontaneous magnetic phase transitions were detected at temperatures of 3.6; 4.6; 5.5; 5.7 K. The nature of these transitions was discussed.

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Magnetoresonance properties of antiferromagnetic TbFe3(BO3)4 at low temperatures

Cited by 3 publications

References 8 publications

Raman scattering under structural and magnetic phase transitions in terbium ferroborate

Raman scattering under structural and magnetic phase transitions in terbium ferroborate

Raman scattering in multiferroic SmFe3(BO3)4

Magnetic properties of DyCr3(BO3)4

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