Peculiarities of optical absorption spectra of NdFe${}_3$(BO${}_3$)${}_4$ crystal in magnetically ordered state and at the transition to spiral magnetic phase

Abstract

We study experimentally and theoretically optical absorption spectra of neodymium ferroborate in the temperature range $6-32$ K. We show that the temperature dependences of integral intensities of absorption lines demonstrate qualitatively different behavior for $\sigma$- and $\pi$-polarizations of the light. We suggest that this behavior may be caused by the appearance of a spiral magnetic structure in the compound under study. To describe the temperature dependences of lines intensities we propose a theoretical model which takes into account the Dzyaloshinskii-Moriya interaction between Nd${}^{3+}$ and Fe${}^{3+}$ ions.

18 pages, 6 figures

References in corpus (4)

• Evidence for differentiation in the iron-helicoidal-chain in GdFe${}_3$(BO${}_3$)${}_4$
• Optical spectra, crystal-field parameters, and magnetic susceptibility of the new multiferroic NdFe3(BO3)4
• Non-Resonant X-ray Magnetic Scattering on Rare-Earth Iron Borates RFe${}_3$(BO${}_3$)${}_4$
• Magnetic frustration, phase competition and the magneto-electric effect in NdFe3(BO3)4