Electron transitions and local properties of Nd3+ ion in Nd0.5Gd0.5Fe3(BO3)4 single crystal

TL;DR

This study investigates the optical and magnetic properties of Nd3+ ions in a Nd-Gd-Fe-BO crystal, revealing state-dependent local magnetic behaviors and changes in electron transition rules under magnetic ordering.

Contribution

It provides detailed analysis of Nd3+ electron transitions, magnetic interactions, and local magnetic properties in a complex crystal, highlighting state-dependent effects and transition rule modifications.

Findings

Identification of excited 4f states and their wave functions.

Observation of state-dependent local magnetic properties.

Detection of changes in electron transition rules in the magnetically ordered state.

Abstract

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.