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

V. V. Slavin, I. S. Kachur, V. S. Kurnosov +1

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 integra…