High-resolution spectroscopy of HoFe3(BO3)4 crystal: a study of phase transitions


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The transmission spectra of HoFe3(BO3) multiferroic single crystals are studied by optical Fourier-transform spectroscopy at temperatures of 1.7–423 K in polarized light in the spectral range 500–10 000 cm–1 with a resolution up to 0.1 cm–1. A new first-order structural phase transition close to the second-order transition is recorded at Tc = 360 K by the appearance of a new phonon mode at 976 cm–1. The reasons for considerable differences in Tc for different samples of holmium ferroborate are discussed. By temperature variations in the spectra of the f–f transitions in the Ho3+ ion, we studied two magnetic phase transitions, namely, magnetic ordering into an easy-plane structure as a second-order phase transition at TN = 39 K and spin reorientation from the ab plane to the c axis as a first-order phase transition at TSR = 4.7 ± 0.2 K. It is shown that erbium impurity in a concentration of 1 at % decreases the spin-reorientation transition temperature to TSR = 4.0 K.

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M. Popova

Institute of Spectroscopy

编辑信件的主要联系方式.
Email: popova@isan.troitsk.ru
俄罗斯联邦, Troitsk, Moscow, 108840

D. Erofeev

Institute of Spectroscopy; Moscow Institute of Physics and Technology (State University)

Email: popova@isan.troitsk.ru
俄罗斯联邦, Troitsk, Moscow, 108840; Dolgoprudnyi, Moscow oblast, 141700

E. Chukalina

Institute of Spectroscopy

Email: popova@isan.troitsk.ru
俄罗斯联邦, Troitsk, Moscow, 108840

L. Bezmaternykh

Kirenskii Institute of Physics, Siberian Branch

Email: popova@isan.troitsk.ru
俄罗斯联邦, Krasnoyarsk, 660036

I. Gudim

Kirenskii Institute of Physics, Siberian Branch

Email: popova@isan.troitsk.ru
俄罗斯联邦, Krasnoyarsk, 660036

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