2015/07/15 by A.V. Malakhovskii, A. V. Malakhovskii, S. L. Gnatchenko +11
Earth and Planetary Sciences · Materials Science · Physics and Astronomy · #Crystal Structures and Properties #FOS: Physical sciences #Materials Science (cond-mat.mtrl-sci) #Mineralogy and Gemology Studies #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.mtrl-sci #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.1507.04210
24 pages, 41 figures
arxiv created 2015/07/15 · openalex publication_date 2015/07/15 · arxiv updated 2015/07/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
Polarized absorption spectra and magnetic circular dichroism (MCD) spectra of Nd0.5Gd0.5Fe3(BO3)4 single crystal were measured in the range of 10000 - 21000 cm-1. The absorption spectra were studied as a function of temperature in the range of 2 - 293 K and as a function of magnetic field 0 - 65 kOe at 2 K. The excited 4f states of the Nd3+ ion were identified in terms of the irreducible representations and in terms of |J,+-MJ> wave functions of the free atom. The changes of the Lande factor during f-f transitions and the exchange splitting of the ground and excited states were determined. It was found out that the selection rules for electron transitions substantially changed in the magnetically ordered state of the crystal. They are different for the different transitions and they strongly depend on the orientation of the Fe sublattice magnetic moment relative to the light polarization. It was revealed that the local magnetic properties in the vicinity of the excited Nd3+ ion substantially depended on its state. In particular, in some excited states a weak ferromagnetic moment appears, the field induced reorientation magnetic transitions occur and the changes of the local magnetic anisotropy type take place. In some excited states the nonequivalent Nd3+ centers were found out.